language/italian: replace Scaricamento with download/downloading

fixes #488

v2: add suggestions by dudeing (desura forum)
cef: move arguments for cef build into inc file

Conflicts:
	cmake/patches/cef.patch
cef: add proprietary_codecs=0 and ffmpeg_branding=Chromium to cef build system
cmake: add switch for h.264 support

v2: add H264_SUPPORT documentation
cmake: add WITH_FLASH option