French translation + automatic select best matching locale

src/components/About.vue

@@ -1,17 +1,17 @@
 <template>
     <v-container fluid>
         <v-layout row>
-            <v-flex xs12>
-                <p>This app lets you track and share issues with bike lanes.</p>
+            <v-flex xs6 offset-xs3>
+                <p>{{ $t('about.summary') }}</p>
 
-                <h2 class="body-2">The available reports so far are:</h2>
+                <h2 class="body-2">{{ $t('about.availableReportsTitle') }}</h2>
                 <ul class="ml-3">
-                    <li><strong>GCUM</strong>: A car poorly parked on a bike lane.</li>
-                    <li><strong>Interrupt</strong>: An interruption of the bike lane (works, unexpected end of the bike lane, etc.).</li>
-                    <li><strong>Pothole</strong>: A pothole in the ground.</li>
+                    <li><strong>{{ $t('reportLabels.gcum') }}</strong>{{ $t('misc.spaceBeforeDoublePunctuations') }}: {{ $t('about.gcumDescription') }}</li>
+                    <li><strong>{{ $t('reportLabels.interrupt') }}</strong>{{ $t('misc.spaceBeforeDoublePunctuations') }}: {{ $t('about.interruptDescription') }}</li>
+                    <li><strong>{{ $t('reportLabels.pothole') }}</strong>{{ $t('misc.spaceBeforeDoublePunctuations') }}: {{ $t('about.potholeDescription') }}</li>
                 </ul>
 
-                <p class="mt-3">It is released under an <a href="">MIT license</a>. The map background is using tiles from <a href="https://www.opencyclemap.org/docs/">OpenCycleMap</a>, thanks to <a href="">OpenStreetMap contributors</a> and <a href="">Leaflet</a>.</p>
+                <p class="mt-3" v-html="$t('about.license')"></p>
 
             </v-flex>
         </v-layout>

src/i18n/en.js

@@ -1,5 +1,13 @@
 // Keys should be sorted alphabetically
 export default {
+    about: {
+        availableReportsTitle: 'The available reports so far are:',
+        gcumDescription: 'A car poorly parked on a bike lane.',
+        interruptDescription: 'An interruption of the bike lane (works, unexpected end of the bike lane, etc.).',
+        license: 'It is released under an <a href="https://opensource.org/licenses/MIT">MIT license</a>. The map background is using tiles from <a href="https://www.opencyclemap.org/docs/">OpenCycleMap</a>, thanks to <a href="https://www.openstreetmap.org/copyright">OpenStreetMap contributors</a> and <a href="http://leafletjs.com/">Leaflet</a>.',
+        potholeDescription: 'A pothole in the ground.',
+        summary: 'This app lets you track and share issues with bike lanes.',
+    },
     geolocation: {
         fetching: 'Fetching current position…',
         unavailable: 'Sorry, geolocation is not available in your browser.',
@@ -7,6 +15,9 @@ export default {
     menu: {
         About: 'About',
     },
+    misc: {
+        spaceBeforeDoublePunctuations: '',
+    },
     reportLabels: {
         gcum: 'GCUM',
         interrupt: 'Interruption',

src/i18n/fr.js

@@ -0,0 +1,26 @@
+// Keys should be sorted alphabetically
+export default {
+    about: {
+        availableReportsTitle: "Les signalements disponibles pour l'instant sont :",
+        gcumDescription: 'Une voiture (mal) garée sur la piste cyclable.',
+        interruptDescription: "Une interruption d'itinéraire cyclable (travaux, arrêt inattendu d'une piste cyclable, etc)",
+        license: "Le code source est sous <a href='https://opensource.org/licenses/MIT'>licence MIT license</a>. Les tuiles de fond de carte proviennent de chez <a href='https://www.opencyclemap.org/docs/'>OpenCycleMap</a>, grace aux <a href='https://www.openstreetmap.org/copyright'>contributeurs OpenStreetMap</a> et à <a href='http://leafletjs.com/'>Leaflet</a>.",
+        potholeDescription: 'Un nid de poule dans la route.',
+        summary: 'Cette application vous permet de signaler et de partager des problèmes avec les itinéraires cyclables.',
+    },
+    geolocation: {
+        fetching: 'En attente de votre position…',
+        unavailable: "Désolé, la géolocalisation n'est pas disponible dans votre navigateur.",
+    },
+    menu: {
+        About: 'À-propos',
+    },
+    misc: {
+        spaceBeforeDoublePunctuations: ' ',
+    },
+    reportLabels: {
+        gcum: 'GCUM',
+        interrupt: 'Interruption',
+        pothole: 'Nid de poule',
+    },
+};

src/i18n/index.js

@@ -2,14 +2,53 @@ import Vue from 'vue';
 import VueI18n from 'vue-i18n';
 
 import en from './en';
+import fr from './fr';
 
 Vue.use(VueI18n);
 
+export function getBrowserLocales() {
+    let langs = [];
+
+    if (navigator.languages) {
+        // Chrome does not currently set navigator.language correctly
+        // https://code.google.com/p/chromium/issues/detail?id=101138
+        // but it does set the first element of navigator.languages correctly
+        langs = navigator.languages;
+    } else if (navigator.userLanguage) {
+        // IE only
+        langs = [navigator.userLanguage];
+    } else {
+        // as of this writing the latest version of firefox + safari set this correctly
+        langs = [navigator.language];
+    }
+
+    // Some browsers does not return uppercase for second part
+    const locales = langs.map((lang) => {
+        const locale = lang.split('-');
+        return locale[1] ? `${locale[0]}-${locale[1].toUpperCase()}` : lang;
+    });
+
+    return locales;
+}
+
 const messages = {
     en,
+    fr,
 };
 
+
+const locales = getBrowserLocales();
+
+let locale = 'en'; // Safe default
+// Get best matching locale
+for (let i = 0; i < locales.length; i += 1) {
+    if (messages[locales[i]]) {
+        locale = locales[i];
+        break; // Break at first matching locale
+    }
+}
+
 export default new VueI18n({
-    locale: 'en',
+    locale,
     messages,
 });