make preferences work #179

client/i18next-scanner.config.cjs

@@ -36,7 +36,7 @@ module.exports = {
         },
         lngs: ['en','de'],
         ns: [],
-        defaultLng: 'en',
+        defaultLng: 'en-GB',
         defaultNs: 'translation',
          defaultValue: (lng, ns, key) => {
             if (lng === 'en') {

client/public/locales/de/translation.json

@@ -1,4 +1,5 @@
 {
+  "Tactics": "Taktiken",
   "Lean Game Server": "Lean-Spieleserver",
   "<p>Game rules determine if it is allowed to skip levels and if the games runs checks to only allow unlocked tactics and theorems in proofs.</p><1>Note: \"Unlocked\" tactics (or theorems) are determined by two things: The set of minimal tactics needed to solve a level, plus any tactics you unlocked in another level. That means if you unlock <1>simp</1> in a level, you can use it henceforth in any level.</1><p>The options are:</p>": "<p>Die Spielregeln bestimmen ob es erlaubt ist, Levels zu überspringen und ob das Spiel überprüft welche Taktiken und Theoreme freigeschaltet sind und nur diese im Beweis akzeptiert.</p><1>Bemerkung: \"Freigeschaltete\" Taktiken (und Theoreme) werden durch zwei Faktoren bestimmt: The Menge der Taktiken die minimal notwending sind um den Level zu lösen und dazu die Menge aller Taktiken, die in einem anderen Level freigeschaltet wurden. Das bedeutet wenn <1>simp</1> in einem Level freigeschaltet wird, kann diese Taktik danach in jeglichen Levels verwendet werden.",
   "Game Rules": "Spielregeln",
@@ -7,5 +8,5 @@
   "regular": "regulär",
   "relaxed": "relaxed",
   "none": "keine",
-  "Rules": "Regend"
+  "Rules": "Regeln"
 }

client/public/locales/en/translation.json

@@ -1,4 +1,5 @@
 {
+  "Tactics": "Tactics",
   "Lean Game Server": "Lean Game Server",
   "<p>Game rules determine if it is allowed to skip levels and if the games runs checks to only allow unlocked tactics and theorems in proofs.</p><1>Note: \"Unlocked\" tactics (or theorems) are determined by two things: The set of minimal tactics needed to solve a level, plus any tactics you unlocked in another level. That means if you unlock <1>simp</1> in a level, you can use it henceforth in any level.</1><p>The options are:</p>": "<p>Game rules determine if it is allowed to skip levels and if the games runs checks to only allow unlocked tactics and theorems in proofs.</p><1>Note: \"Unlocked\" tactics (or theorems) are determined by two things: The set of minimal tactics needed to solve a level, plus any tactics you unlocked in another level. That means if you unlock <1>simp</1> in a level, you can use it henceforth in any level.</1><p>The options are:</p>",
   "Game Rules": "Game Rules",

client/src/app.tsx

@@ -10,6 +10,7 @@ import './css/reset.css';
 import './css/app.css';
 import { PreferencesContext} from './components/infoview/context';
 import UsePreferences from "./state/hooks/use_preferences"
+import i18n from './i18n';
 
 export const GameIdContext = React.createContext<string>(undefined);
 
@@ -18,12 +19,16 @@ function App() {
   const params = useParams()
   const gameId = "g/" + params.owner + "/" + params.repo
 
-  const {mobile, layout, isSavePreferences, setLayout, setIsSavePreferences} = UsePreferences()
+  const {mobile, layout, isSavePreferences, language, setLayout, setIsSavePreferences, setLanguage} = UsePreferences()
+
+  React.useEffect(() => {
+    i18n.changeLanguage(language)
+  }, [language])
 
   return (
     <div className="app">
       <GameIdContext.Provider value={gameId}>
-          <PreferencesContext.Provider value={{mobile, layout, isSavePreferences, setLayout, setIsSavePreferences}}>
+          <PreferencesContext.Provider value={{mobile, layout, isSavePreferences, language, setLayout, setIsSavePreferences, setLanguage}}>
             <React.Suspense>
               <Outlet />
             </React.Suspense>

client/src/components/app_bar.tsx

@@ -14,6 +14,7 @@ import { useAppDispatch, useAppSelector } from '../hooks'
 import { Button } from './button'
 import { downloadProgress } from './popup/erase'
 import ReactCountryFlag from "react-country-flag"
+import { t } from 'i18next'
 
 /** navigation buttons for mobile welcome page to switch between intro/tree/inventory. */
 function MobileNavButtons({pageNumber, setPageNumber}:
@@ -119,28 +120,46 @@ function InputModeButton({setNavOpen, isDropdown}) {
   </Button>
 }
 
-/** button to toggle iimpressum popup */
+/** button to toggle iimpressum popup
+ *
+ * Note: Do not translate "Impressum"!
+*/
 function ImpressumButton({setNavOpen, toggleImpressum, isDropdown}) {
-  return <Button className="btn btn-inverted toggle-width"
+  return <Button className="btn btn-inverted"
     title="information, Impressum, privacy policy" inverted="true" to="" onClick={(ev) => {toggleImpressum(ev); setNavOpen(false)}}>
     <FontAwesomeIcon icon={faCircleInfo} />
-    {isDropdown && <>&nbsp;Info &amp; Impressum</>}
+    {isDropdown && <>&nbsp;Impressum</>}
+  </Button>
+}
+
+function PreferencesButton({setNavOpen, togglePreferencesPopup}) {
+  return <Button title="Preferences" inverted="true" to="" onClick={() => {togglePreferencesPopup(); setNavOpen(false)}}>
+    <FontAwesomeIcon icon={faGear} />&nbsp;{t("Preferences")}
+  </Button>
+}
+
+function GameInfoButton({setNavOpen, toggleInfo}) {
+  return <Button className="btn btn-inverted"
+    title="Game Info & Credits" inverted="true" to="" onClick={() => {toggleInfo(); setNavOpen(false)}}>
+    <FontAwesomeIcon icon={faCircleInfo} />&nbsp;Game Info
+  </Button>
+}
+
+function EraseButton ({setNavOpen, toggleEraseMenu}) {
+  return <Button title="Clear Progress" inverted="true" to="" onClick={() => {toggleEraseMenu(); setNavOpen(false)}}>
+    <FontAwesomeIcon icon={faEraser} />&nbsp;Erase
+  </Button>
+}
+
+function DownloadButton ({setNavOpen, gameId, gameProgress}) {
+  return <Button title="Download Progress" inverted="true" to="" onClick={(ev) => {downloadProgress(gameId, gameProgress, ev); setNavOpen(false)}}>
+    <FontAwesomeIcon icon={faDownload} />&nbsp;Download
   </Button>
 }
 
-/** button to toggle iimpressum popup */
+function UploadButton ({setNavOpen, toggleUploadMenu}) {
-function LanguageButton({setNavOpen, toggleLangNav, isDropdown}) {
+  return <Button title="Load Progress from JSON" inverted="true" to="" onClick={() => {toggleUploadMenu(); setNavOpen(false)}}>
-  return <Button className="btn btn-inverted language-btn"
+    <FontAwesomeIcon icon={faUpload} />&nbsp;Upload
-    title="language" inverted="true" to="" onClick={(ev) => {toggleLangNav(ev); setNavOpen(false)}}>
-    <ReactCountryFlag countryCode="GB"
-      className="emojiFlag"
-      style={{
-          height: '1.3em',
-          width: '1.6em',
-      }}
-      title="English"
-    />
-    {isDropdown && <>&nbsp;Language</>}
   </Button>
 }
 
@@ -153,6 +172,12 @@ function HomeButton({isDropdown}) {
   </Button>
 }
 
+function LandingPageButton() {
+  return <Button inverted="false" title="back to games selection" to="/">
+    <FontAwesomeIcon icon={faArrowLeft} />&nbsp;<FontAwesomeIcon icon={faGlobe} />
+    </Button>
+}
+
 /** button in mobile level to toggle inventory.
  * only displays a button if `setPageNumber` is set.
  */
@@ -184,9 +209,7 @@ export function WelcomeAppBar({pageNumber, setPageNumber, gameInfo, toggleImpres
 
   return <div className="app-bar">
     <div className='app-bar-left'>
-      <Button inverted="false" title="back to games selection" to="/">
+      <LandingPageButton />
-        <FontAwesomeIcon icon={faArrowLeft} />&nbsp;<FontAwesomeIcon icon={faGlobe} />
-      </Button>
       <span className="app-bar-title"></span>
     </div>
     <div>
@@ -197,33 +220,23 @@ export function WelcomeAppBar({pageNumber, setPageNumber, gameInfo, toggleImpres
       <MenuButton navOpen={navOpen} setNavOpen={setNavOpen} />
     </div>
     <div className={'menu dropdown' + (navOpen ? '' : ' hidden')}>
-      <Button title="Game Info & Credits" inverted="true" to="" onClick={() => {toggleInfo(); setNavOpen(false)}}>
+      <GameInfoButton setNavOpen={setNavOpen} toggleInfo={toggleInfo}/>
-        <FontAwesomeIcon icon={faCircleInfo} />&nbsp;Game Info
+      <EraseButton setNavOpen={setNavOpen} toggleEraseMenu={toggleEraseMenu}/>
-      </Button>
+      <DownloadButton setNavOpen={setNavOpen} gameId={gameId} gameProgress={gameProgress}/>
-      <Button title="Clear Progress" inverted="true" to="" onClick={() => {toggleEraseMenu(); setNavOpen(false)}}>
+      <UploadButton setNavOpen={setNavOpen} toggleUploadMenu={toggleUploadMenu}/>
-        <FontAwesomeIcon icon={faEraser} />&nbsp;Erase
+      <ImpressumButton setNavOpen={setNavOpen} toggleImpressum={toggleImpressum} isDropdown={true} />
-      </Button>
+      <PreferencesButton setNavOpen={setNavOpen} togglePreferencesPopup={togglePreferencesPopup}/>
-      <Button title="Download Progress" inverted="true" to="" onClick={(ev) => {downloadProgress(gameId, gameProgress, ev); setNavOpen(false)}}>
-        <FontAwesomeIcon icon={faDownload} />&nbsp;Download
-      </Button>
-      <Button title="Load Progress from JSON" inverted="true" to="" onClick={() => {toggleUploadMenu(); setNavOpen(false)}}>
-        <FontAwesomeIcon icon={faUpload} />&nbsp;Upload
-      </Button>
-      <Button title="Impressum, privacy policy" inverted="true" to="" onClick={() => {toggleImpressum(); setNavOpen(false)}}>
-        <FontAwesomeIcon icon={faCircleInfo} />&nbsp;Impressum
-      </Button>
-      <Button title="Preferences" inverted="true" to="" onClick={() => {togglePreferencesPopup(); setNavOpen(false)}}>
-         <FontAwesomeIcon icon={faGear} />&nbsp;Preferences
-       </Button>
     </div>
   </div>
 }
 
 /** the navigation bar in a level */
-export function LevelAppBar({isLoading, levelTitle, toggleImpressum, pageNumber=undefined, setPageNumber=undefined} : {
+export function LevelAppBar({isLoading, levelTitle, toggleImpressum, toggleInfo, togglePreferencesPopup, pageNumber=undefined, setPageNumber=undefined} : {
   isLoading: boolean,
   levelTitle: string,
   toggleImpressum: any,
+  toggleInfo: any,
+  togglePreferencesPopup: any,
   pageNumber?: number,
   setPageNumber?: any,
 }) {
@@ -253,15 +266,16 @@ export function LevelAppBar({isLoading, levelTitle, toggleImpressum, pageNumber=
           <PreviousButton setNavOpen={setNavOpen} />
           <HomeButton isDropdown={true} />
           <InputModeButton setNavOpen={setNavOpen} isDropdown={true}/>
+          <GameInfoButton setNavOpen={setNavOpen} toggleInfo={toggleInfo}/>
           <ImpressumButton setNavOpen={setNavOpen} toggleImpressum={toggleImpressum} isDropdown={true} />
-          <LanguageButton setNavOpen={setNavOpen} toggleLangNav={() => {}} isDropdown={true} />
+          <PreferencesButton setNavOpen={setNavOpen} togglePreferencesPopup={togglePreferencesPopup}/>
         </div>
       </> :
       <>
         {/* DESKTOP VERSION */}
         <div className='app-bar-left'>
           <HomeButton isDropdown={false} />
-          <span className="app-bar-title">{worldTitle && `World: ${worldTitle}`}</span>
+          <span className="app-bar-title">{worldTitle && `${t("World")}: ${worldTitle}`}</span>
         </div>
         <div>
           <span className="app-bar-title">{levelTitle}</span>
@@ -270,8 +284,12 @@ export function LevelAppBar({isLoading, levelTitle, toggleImpressum, pageNumber=
           <PreviousButton setNavOpen={setNavOpen} />
           <NextButton worldSize={gameInfo.data?.worldSize[worldId]} difficulty={difficulty} completed={completed} setNavOpen={setNavOpen} />
           <InputModeButton setNavOpen={setNavOpen} isDropdown={false}/>
-          <ImpressumButton setNavOpen={setNavOpen} toggleImpressum={toggleImpressum} isDropdown={false} />
+          <MenuButton navOpen={navOpen} setNavOpen={setNavOpen}/>
-          <LanguageButton setNavOpen={setNavOpen} toggleLangNav={() => {}} isDropdown={false} />
+        </div>
+        <div className={'menu dropdown' + (navOpen ? '' : ' hidden')}>
+          <GameInfoButton setNavOpen={setNavOpen} toggleInfo={toggleInfo}/>
+          <ImpressumButton setNavOpen={setNavOpen} toggleImpressum={toggleImpressum} isDropdown={true} />
+          <PreferencesButton setNavOpen={setNavOpen} togglePreferencesPopup={togglePreferencesPopup}/>
         </div>
       </>
     }

client/src/components/infoview/context.ts

@@ -79,15 +79,18 @@ export interface ProofStateProps {
 export interface IPreferencesContext extends PreferencesState{
   mobile: boolean, // The variables that actually control the page 'layout' can only be changed through layout.
   setLayout: React.Dispatch<React.SetStateAction<PreferencesState["layout"]>>;
-  setIsSavePreferences: React.Dispatch<React.SetStateAction<Boolean>>;
+  setIsSavePreferences: React.Dispatch<React.SetStateAction<PreferencesState["isSavePreferences"]>>;
+  setLanguage: React.Dispatch<React.SetStateAction<PreferencesState["language"]>>;
 }
 
 export const PreferencesContext = React.createContext<IPreferencesContext>({
   mobile: false,
   layout: "auto",
   isSavePreferences: false,
+  language: "en",
   setLayout: () => {},
-  setIsSavePreferences: () => {}
+  setIsSavePreferences: () => {},
+  setLanguage: () => {},
 })
 
 export const WorldLevelIdContext = React.createContext<{

client/src/components/inventory.tsx

@@ -10,6 +10,7 @@ import { useLoadDocQuery, InventoryTile, LevelInfo, InventoryOverview, useLoadIn
 import { selectDifficulty, selectInventory } from '../state/progress';
 import { store } from '../state/store';
 import { useSelector } from 'react-redux';
+import { t } from 'i18next';
 
 export function Inventory({levelInfo, openDoc, lemmaTab, setLemmaTab, enableAll=false} :
   {
@@ -24,7 +25,7 @@ export function Inventory({levelInfo, openDoc, lemmaTab, setLemmaTab, enableAll=
     <div className="inventory">
     {/* TODO: Click on Tactic: show info
       TODO: click on paste icon -> paste into command line */}
-      <h2>Tactics</h2>
+      <h2>{t("Tactics")}</h2>
       {levelInfo?.tactics &&
         <InventoryList items={levelInfo?.tactics} docType="Tactic" openDoc={openDoc} enableAll={enableAll}/>
       }

client/src/components/level.tsx

@@ -51,6 +51,8 @@ import { IConnectionProvider } from 'monaco-languageclient'
 import { monacoSetup } from 'lean4web/client/src/monacoSetup'
 import { onigasmH } from 'onigasm/lib/onigasmH'
 import { isLastStepWithErrors, lastStepHasErrors } from './infoview/goals'
+import { InfoPopup } from './popup/game_info'
+import { PreferencesPopup } from './popup/preferences'
 
 
 monacoSetup()
@@ -60,17 +62,29 @@ function Level() {
   const levelId = parseInt(params.levelId)
   const worldId = params.worldId
 
+  const {layout, isSavePreferences, language, setLayout, setIsSavePreferences, setLanguage} = React.useContext(PreferencesContext)
+  const gameId = React.useContext(GameIdContext)
+  const gameInfo = useGetGameInfoQuery({game: gameId})
+
+  // pop-ups
   const [impressum, setImpressum] = React.useState(false)
+  const [info, setInfo] = React.useState(false)
+  const [preferencesPopup, setPreferencesPopup] = React.useState(false)
 
-  const closeImpressum = () => {
+  function closeImpressum()   {setImpressum(false)}
-    setImpressum(false)
+  function closeInfo()        {setInfo(false)}
-  }
+  function closePreferencesPopup() {setPreferencesPopup(false)}
+  function toggleImpressum()  {setImpressum(!impressum)}
+  function toggleInfo()       {setInfo(!info)}
+  function togglePreferencesPopup() {setPreferencesPopup(!preferencesPopup)}
 
   return <WorldLevelIdContext.Provider value={{worldId, levelId}}>
     {levelId == 0 ?
-      <Introduction impressum={impressum} setImpressum={setImpressum} /> :
+      <Introduction impressum={impressum} setImpressum={setImpressum} toggleInfo={toggleInfo} togglePreferencesPopup={togglePreferencesPopup} /> :
-      <PlayableLevel key={`${worldId}/${levelId}`} impressum={impressum} setImpressum={setImpressum} />}
+      <PlayableLevel key={`${worldId}/${levelId}`} impressum={impressum} setImpressum={setImpressum} toggleInfo={toggleInfo} togglePreferencesPopup={togglePreferencesPopup}/>}
     {impressum ? <PrivacyPolicyPopup handleClose={closeImpressum} /> : null}
+    {info ? <InfoPopup info={gameInfo.data?.info} handleClose={closeInfo}/> : null}
+    {preferencesPopup ? <PreferencesPopup layout={layout} isSavePreferences={isSavePreferences} setLayout={setLayout} setIsSavePreferences={setIsSavePreferences} handleClose={closePreferencesPopup} language={language} setLanguage={setLanguage}/> : null}
   </WorldLevelIdContext.Provider>
 }
 
@@ -190,7 +204,7 @@ function ExercisePanel({codeviewRef, visible=true}: {codeviewRef: React.MutableR
   </div>
 }
 
-function PlayableLevel({impressum, setImpressum}) {
+function PlayableLevel({impressum, setImpressum, toggleInfo, togglePreferencesPopup}) {
   const codeviewRef = useRef<HTMLDivElement>(null)
   const gameId = React.useContext(GameIdContext)
   const {worldId, levelId} = useContext(WorldLevelIdContext)
@@ -396,7 +410,10 @@ function PlayableLevel({impressum, setImpressum}) {
                   isLoading={level.isLoading}
                   levelTitle={`${mobile ? '' : 'Level '}${levelId} / ${gameInfo.data?.worldSize[worldId]}` +
                     (level?.data?.title && ` : ${level?.data?.title}`)}
-                  toggleImpressum={toggleImpressum} />
+                  toggleImpressum={toggleImpressum}
+                  toggleInfo={toggleInfo}
+                  togglePreferencesPopup={togglePreferencesPopup}
+                  />
                 {mobile?
                   // TODO: This is copied from the `Split` component below...
                   <>
@@ -452,7 +469,7 @@ function IntroductionPanel({gameInfo}) {
 export default Level
 
 /** The site with the introduction text of a world */
-function Introduction({impressum, setImpressum}) {
+function Introduction({impressum, setImpressum, toggleInfo, togglePreferencesPopup}) {
   const gameId = React.useContext(GameIdContext)
   const {mobile} = useContext(PreferencesContext)
 
@@ -470,7 +487,7 @@ function Introduction({impressum, setImpressum}) {
   }
 
   return <>
-    <LevelAppBar isLoading={gameInfo.isLoading} levelTitle="Introduction" toggleImpressum={toggleImpressum}/>
+    <LevelAppBar isLoading={gameInfo.isLoading} levelTitle="Introduction" toggleImpressum={toggleImpressum} toggleInfo={toggleInfo} togglePreferencesPopup={togglePreferencesPopup}/>
     {gameInfo.isLoading ?
       <div className="app-content loading"><CircularProgress /></div>
     : mobile ?

client/src/components/popup/language_config.json

@@ -0,0 +1,14 @@
+{
+  "languages": [
+    {
+      "iso": "en",
+      "flag": "GB",
+      "name": "English"
+    },
+    {
+      "iso": "de",
+      "flag": "DE",
+      "name": "Deutsch"
+    }
+  ]
+}

client/src/components/popup/preferences.tsx

@@ -1,9 +1,10 @@
 import * as React from 'react'
-import { Input, MenuItem, Select, Typography } from '@mui/material'
+import { Input, MenuItem, Select, SelectChangeEvent, Typography } from '@mui/material'
 import Markdown from '../markdown'
 import { Switch, Button, ButtonGroup } from '@mui/material';
 import Box from '@mui/material/Box';
 import Slider from '@mui/material/Slider';
+import supportedLanguages from './language_config.json'
 
 import FormControlLabel from '@mui/material/FormControlLabel';
 
@@ -14,7 +15,7 @@ interface PreferencesPopupProps extends Omit<IPreferencesContext, 'mobile'> {
   handleClose: () => void
 }
 
-export function PreferencesPopup({ layout, setLayout, isSavePreferences, setIsSavePreferences, handleClose }: PreferencesPopupProps) {
+export function PreferencesPopup({ layout, setLayout, isSavePreferences, language, setIsSavePreferences, handleClose, setLanguage }: PreferencesPopupProps) {
 
   const marks = [
     {
@@ -38,6 +39,10 @@ export function PreferencesPopup({ layout, setLayout, isSavePreferences, setIsSa
     setLayout(marks[value].key as IPreferencesContext["layout"])
   }
 
+  const handlerChangeLanguage = (ev: SelectChangeEvent<string>) => {
+    setLanguage(ev.target.value as IPreferencesContext["language"])
+  }
+
   return <div className="modal-wrapper">
     <div className="modal-backdrop" onClick={handleClose} />
     <div className="modal">
@@ -52,11 +57,10 @@ export function PreferencesPopup({ layout, setLayout, isSavePreferences, setIsSa
               control={
                 <Box sx={{ width: 300 }}>
                   <Select
-                                        value={'GB'}
+                    value={language}
-                                        label={"Language"}>
+                    label={"Language"}
-                                        <MenuItem value={'GB'}>
+                    onChange={handlerChangeLanguage}>
-                                            <ReactCountryFlag countryCode="GB"/>&nbsp;English
+                      {supportedLanguages.languages.map(lang => {return <MenuItem key={`menu-item-lang-${lang.iso}`} value={lang.iso}><ReactCountryFlag countryCode={lang.flag}/>&nbsp;{lang.name}</MenuItem>})}
-                                        </MenuItem>
                   </Select>
                 </Box>
               }

client/src/components/welcome.tsx

@@ -65,7 +65,7 @@ function IntroductionPanel({introduction, setPageNumber}: {introduction: string,
 function Welcome() {
   const gameId = React.useContext(GameIdContext)
   const {mobile} = React.useContext(PreferencesContext)
-  const {layout, isSavePreferences, setLayout, setIsSavePreferences} = React.useContext(PreferencesContext)
+  const {layout, isSavePreferences, language, setLayout, setIsSavePreferences, setLanguage} = React.useContext(PreferencesContext)
 
   const gameInfo = useGetGameInfoQuery({game: gameId})
   const inventory = useLoadInventoryOverviewQuery({game: gameId})
@@ -135,7 +135,7 @@ function Welcome() {
     {eraseMenu? <ErasePopup handleClose={closeEraseMenu}/> : null}
     {uploadMenu? <UploadPopup handleClose={closeUploadMenu}/> : null}
     {info ? <InfoPopup info={gameInfo.data?.info} handleClose={closeInfo}/> : null}
-    {preferencesPopup ? <PreferencesPopup layout={layout} isSavePreferences={isSavePreferences} setLayout={setLayout} setIsSavePreferences={setIsSavePreferences} handleClose={closePreferencesPopup}/> : null}
+    {preferencesPopup ? <PreferencesPopup layout={layout} isSavePreferences={isSavePreferences} setLayout={setLayout} setIsSavePreferences={setIsSavePreferences} handleClose={closePreferencesPopup} language={language} setLanguage={setLanguage}/> : null}
   </>
 }
 

client/src/state/hooks/use_preferences.ts

@@ -4,6 +4,7 @@ import {
     PreferencesState,
     setLayout as setPreferencesLayout,
     setIsSavePreferences as setPreferencesIsSavePreferences,
+    setLanguage as setLanguagePreferences,
     getWindowDimensions,
     AUTO_SWITCH_THRESHOLD
 } from "../preferences";
@@ -19,6 +20,9 @@ const UsePreferences = () => {
     const isSavePreferences = useAppSelector((state) => state.preferences.isSavePreferences);
     const setIsSavePreferences = (isSave: boolean) => dispatch(setPreferencesIsSavePreferences(isSave))
 
+    const language = useAppSelector((state) => state.preferences.language);
+    const setLanguage = (lang: string) => dispatch(setLanguagePreferences(lang))
+
     const automaticallyAdjustLayout = () => {
         const {width} = getWindowDimensions()
         setMobile(width < AUTO_SWITCH_THRESHOLD)
@@ -35,7 +39,7 @@ const UsePreferences = () => {
         }
     }, [layout])
 
-    return {mobile, layout, isSavePreferences, setLayout, setIsSavePreferences}
+    return {mobile, layout, isSavePreferences, language, setLayout, setIsSavePreferences, setLanguage}
 }
 
 export default UsePreferences;

client/src/state/preferences.ts

@@ -5,6 +5,7 @@ import { loadPreferences, removePreferences, savePreferences } from "./local_sto
 export interface PreferencesState {
   layout: "mobile" | "auto" | "desktop";
   isSavePreferences: boolean;
+  language: string;
 }
 
 export function getWindowDimensions() {
@@ -16,7 +17,8 @@ export const AUTO_SWITCH_THRESHOLD = 800
 
 const initialState: PreferencesState = loadPreferences() ??{
     layout: "auto",
-    isSavePreferences: false
+    isSavePreferences: false,
+    language: "en",
 }
 
 export const preferencesSlice = createSlice({
@@ -29,7 +31,10 @@ export const preferencesSlice = createSlice({
     setIsSavePreferences: (state, action) => {
       state.isSavePreferences = action.payload;
     },
+    setLanguage: (state, action) => {
+      state.language = action.payload;
+    },
   },
 });
 
-export const { setLayout, setIsSavePreferences } = preferencesSlice.actions;
+export const { setLayout, setIsSavePreferences, setLanguage } = preferencesSlice.actions;