[diades]

Well you shouldn't have installed the language file, the product is in english by default.

I followed the instructions:

Upgrade from the version 2.3.0 or newer
The upgrade instructions are the following:
Upload the content of the Files folder in your forum root.
Upload the content of the Images in each of your forum styles directories.
Log into the admin control panel of your forum and import the product located in the Product folder.
Go in the Download/Upload item of the Language manager menu and then:
Select the English language file from the Lang folder.
Select the forum language to overwrite.
Set the Ignore language version option to YES.
Launch the upload.
You have succesfully upgraded your chatbox, you just have now to set the new permissions and options.
If you plan on using the option to display users number of chats in the postbit and/or in the profile, go in your admin control panel and run the update counter script from the chatbox menu in order that the older chats gets taken into account.
You are done.