diff --git a/frontend/src/locales/dateTimeFormats/da.json b/frontend/src/locales/dateTimeFormats/da-DK.json
similarity index 100%
rename from frontend/src/locales/dateTimeFormats/da.json
rename to frontend/src/locales/dateTimeFormats/da-DK.json
diff --git a/frontend/src/locales/dateTimeFormats/de.json b/frontend/src/locales/dateTimeFormats/de-DE.json
similarity index 100%
rename from frontend/src/locales/dateTimeFormats/de.json
rename to frontend/src/locales/dateTimeFormats/de-DE.json
diff --git a/frontend/src/locales/dateTimeFormats/en.json b/frontend/src/locales/dateTimeFormats/en-US.json
similarity index 100%
rename from frontend/src/locales/dateTimeFormats/en.json
rename to frontend/src/locales/dateTimeFormats/en-US.json
diff --git a/frontend/src/locales/dateTimeFormats/fr.json b/frontend/src/locales/dateTimeFormats/fr-FR.json
similarity index 100%
rename from frontend/src/locales/dateTimeFormats/fr.json
rename to frontend/src/locales/dateTimeFormats/fr-FR.json
diff --git a/frontend/src/locales/dateTimeFormats/pl.json b/frontend/src/locales/dateTimeFormats/pl-PL.json
similarity index 100%
rename from frontend/src/locales/dateTimeFormats/pl.json
rename to frontend/src/locales/dateTimeFormats/pl-PL.json
diff --git a/frontend/src/locales/dateTimeFormats/sv.json b/frontend/src/locales/dateTimeFormats/sv-SE.json
similarity index 100%
rename from frontend/src/locales/dateTimeFormats/sv.json
rename to frontend/src/locales/dateTimeFormats/sv-SE.json
diff --git a/frontend/src/locales/messages/da.json b/frontend/src/locales/messages/da-DK.json
similarity index 100%
rename from frontend/src/locales/messages/da.json
rename to frontend/src/locales/messages/da-DK.json
diff --git a/frontend/src/locales/messages/de.json b/frontend/src/locales/messages/de-DE.json
similarity index 100%
rename from frontend/src/locales/messages/de.json
rename to frontend/src/locales/messages/de-DE.json
diff --git a/frontend/src/locales/messages/en.json b/frontend/src/locales/messages/en-US.json
similarity index 100%
rename from frontend/src/locales/messages/en.json
rename to frontend/src/locales/messages/en-US.json
diff --git a/frontend/src/locales/messages/fr.json b/frontend/src/locales/messages/fr-FR.json
similarity index 100%
rename from frontend/src/locales/messages/fr.json
rename to frontend/src/locales/messages/fr-FR.json
diff --git a/frontend/src/locales/messages/pl.json b/frontend/src/locales/messages/pl-PL.json
similarity index 100%
rename from frontend/src/locales/messages/pl.json
rename to frontend/src/locales/messages/pl-PL.json
diff --git a/frontend/src/locales/messages/sv.json b/frontend/src/locales/messages/sv-SE.json
similarity index 100%
rename from frontend/src/locales/messages/sv.json
rename to frontend/src/locales/messages/sv-SE.json
diff --git a/frontend/src/store/modules/language.js b/frontend/src/store/modules/language.js
index 7eed2de85..50b3a8e83 100644
--- a/frontend/src/store/modules/language.js
+++ b/frontend/src/store/modules/language.js
@@ -5,23 +5,23 @@ const state = {
   allLangs: [
     {
       name: "English",
-      value: "en",
+      value: "en-US",
     },
     {
       name: "Danish",
-      value: "da",
+      value: "da-DK",
     },
     {
       name: "French",
-      value: "fr",
+      value: "fr-FR",
     },
     {
       name: "Polish",
-      value: "pl",
+      value: "pl-PL",
     },
     {
       name: "Swedish",
-      value: "sv",
+      value: "sv-SE",
     },
     {
       name: "简体中文",
@@ -33,7 +33,7 @@ const state = {
     },
     {
       name: "German",
-      value: "de",
+      value: "de-DE",
     },
     {
       name: "Português",