Implement switching language (but doesn't persist)

server/models/language.go

@@ -4,6 +4,7 @@ type LanguageModel struct {
 	Emoji		string `json:"emoji"`
 	Name		string `json:"name"`
 	NameNative	string `json:"nameNative"`
+	Shorthand	string `json:"shorthand"`
 }
 
 func GetLanguageMastersList() []LanguageModel {
@@ -12,10 +13,12 @@ func GetLanguageMastersList() []LanguageModel {
 			Emoji: "🇬🇧",
 			Name: "English",
 			NameNative: "English",
+			Shorthand: "en",
 		}, {
 			Emoji: "🇩🇪",
 			Name: "German",
 			NameNative: "Deutsch",
+			Shorthand: "de",
 		},
 	}
 }