Enable 'ca' locale for Catalan

frontend/angular.json

@@ -26,6 +26,10 @@
             "translation": "src/locale/messages.ar.xlf",
             "baseHref": "/ar/"
           },
+          "ca": {
+            "translation": "src/locale/messages.ca.xlf",
+            "baseHref": "/ca/"
+          },
           "cs": {
             "translation": "src/locale/messages.cs.xlf",
             "baseHref": "/cs/"

frontend/src/app/app.constants.ts

@@ -43,7 +43,7 @@ export const languages: Language[] = [
    { code: 'ar', name: 'العربية' },         // Arabic
 // { code: 'bg', name: 'Български' },       // Bulgarian
 // { code: 'bs', name: 'Bosanski' },        // Bosnian
-// { code: 'ca', name: 'Català' },          // Catalan
+   { code: 'ca', name: 'Català' },          // Catalan
    { code: 'cs', name: 'Čeština' },         // Czech
 // { code: 'da', name: 'Dansk' },           // Danish
    { code: 'de', name: 'Deutsch' },         // German