fixed and updated Russian translation
updated Russian translation
Updated Turkish translation.
MediaFormats: Exclude non-associable formats from the search for supported extensions unless specified.

Fixes #3091
MediaFormats: Write fAssoc variable name in full. (Cosmetic)
CFileAssoc: Prevent non-associable formats from being registered.
CIfo: fix a couple of warnings

It's safe to use explicit casts, all necessary checks are in the 'if' already