successfully compiled, but no changes

Hello, when I do click EN, it says "Language files have been successfully compiled", but no changes on forum and he shows [L[Forums Index]]...

please help me

Mostly problem: Clear your browsers cache

Clear your browsers cache as suggested and now that you have compiled the language, build the forums.  You need to create the different categories in it.

That doesn't work. It says compiled and completed but I have one string refusing to update. When I go to recompile the single string string I get a error message stating not updated. Any ideas?

Have you attempted to clear the servers cache on this?  You can also recompile the Dolphin language files to attempt to resolve this.  Personally, I use phpBB3 as Orca is simply to undependable to bother with.

Compile groups/orca and orca --> There are 2 orca forum systems in Dolphin. One is provided for GROUPS of the Community and the other is the ADMIN/Community FORUM. Make sure you have compiled both ORCA systems in the ADMIN mode ;) 

Curious?  Have you clicked on Manage Forums and created the forums after you compiled the language?