src/main/java/com/bbn/hadder/commands/settings/LanguageCommand.java

@@ -49,8 +49,8 @@ public class LanguageCommand implements Command {
                     break;
                 default:
                     e.getTextChannel().sendMessage(e.getMessageEditor().getMessage(MessageEditor.MessageType.INFO,
-                            "List",
-                            "`de`, `en`, `es`, `fr`, `ru`, `tr`, `zh`")
+                            "commands.settings.language.error.title", "",
+                            "commands.settings.language.error.description", "`de`, `en`, `es`, `fr`, `ru`, `tr`, `zh`")
                             .build()).queue();
                 break;
             }

src/main/resources/Translations/Translations_en.properties

@@ -325,6 +325,8 @@ commands.owner.blacklist.help.description = Blacklist a user for specific comman
 
 commands.settings.language.success.title = Language set
 commands.settings.language.success.description = `%extra%` is your new language now.
+commands.settings.language.error.title = Language not found
+commands.settings.language.error.description = Please choose one of the following language codes: %extra%
 commands.settings.language.help.description = Sets the new primary language for a user.
 commands.settings.prefix.success.title = Successfully set prefix
 commands.settings.prefix.success.description = I successfully set the new prefix for you to `%extra%`.