cmake: drop gtk workaround for ubuntu 10.10

Note: remove also FIND_LIBRARY_USE_LIB64_PATHS that is alredy set in build parameter
Revert "i10n: refresh all languages"

This reverts commit 7a9f4161ea8778dfb75f16ee00f824a6d248444f.
i10n: refresh all languages

Remove the --previous option of po generation. It broke some translations.

Remove the translation of PCSX2 version, no point to translate C format symbol.