Enable 'fr' locale for French

frontend/angular.json

@@ -35,6 +35,10 @@
             "translation": "src/locale/messages.fa.xlf",
             "baseHref": "/fa/"
           },
+          "fr": {
+            "translation": "src/locale/messages.fr.xlf",
+            "baseHref": "/fr/"
+          },
           "ja": {
             "translation": "src/locale/messages.ja.xlf",
             "baseHref": "/ja/"

frontend/src/app/app.constants.ts

@@ -79,7 +79,7 @@ export const languages: Language[] = [
 // { code: 'eo', name: 'Esperanto' },       // Esperanto
 // { code: 'eu', name: 'Euskara' },         // Basque
    { code: 'fa', name: 'فارسی' },           // Persian
-// { code: 'fr', name: 'Français' },        // French
+   { code: 'fr', name: 'Français' },        // French
 // { code: 'gl', name: 'Galego' },          // Galician
 // { code: 'ko', name: '한국어' },          // Korean
 // { code: 'hr', name: 'Hrvatski' },        // Croatian