Add error message for user when executing command

SpigotCore_Main/src/SpigotCore.properties

@@ -17,6 +17,8 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #
 
+COMMAND_SYSTEM_ERROR = §cFehler beim ausführen des Befehls!
+
 SWLISINV_NEXT_PAGE_ACTIVE = §eSeite vor
 SWLISINV_NEXT_PAGE_INACTIVE = §7Seite vor
 SWLISINV_PREVIOUS_PAGE_ACTIVE = §eSeite zurück

SpigotCore_Main/src/de/steamwar/command/SWCommand.java

@@ -19,6 +19,7 @@
 
 package de.steamwar.command;
 
+import de.steamwar.core.Core;
 import de.steamwar.message.Message;
 import lombok.Setter;
 import net.md_5.bungee.api.chat.ClickEvent;
@@ -105,6 +106,7 @@ public abstract class SWCommand {
             if (Bukkit.getServer() != null) {
                 Bukkit.getLogger().log(Level.SEVERE, "", e);
             }
+            Core.MESSAGE.send("COMMAND_SYSTEM_ERROR", sender);
             throw e;
         }
     }