When i try to add a new Stage --> In this example a new location then i have to enter 'add' but the Plugin gives me the message i have to enter it while i have already done that.

Same problem when entering 'cancel'. It always gives me the message to enter something but i already did. And when i try to enter a start region. It thinks 'add' or 'cancel' or some other commands in the Questeditor are regions? Why does the plugin not work suddenly.
My Plugins on the Server are:
http://prntscr.com/c19s1t
Here is the message i am speaking about:
http://prntscr.com/c19s8z

Need ur help very fast.
Thanks a lot :)

Assuming you've got permissions to do so, though whilst unable to provide an explanation for your problem, I'd recommend atleast the following two things whilst waiting on a response.

1. Create a test server, locally, to see if the issue persists with -ONLY- the quests plugin, to rule out interference from any other plugin.
2. Post the version of the quest plugin you are using.

Sorry it was my fault. One of my admins has translated the commands in the language file as well. Works fine now! Thanks for helping me :)