en_US.ini: Remove obsolete string.
Update de_DE.ini

Translating cwcheats interface, adding new option
Update gr_EL.ini
Update ru_RU.ini
Update cs_CZ.ini + tweaks to the original translations
Update en_US.ini.
Merge branch 'master' of https://github.com/hrydgard/ppsspp-lang
cs_CZ.ini: Translate one new string