display better shortcut conflict message
remove unnecessary comma
Ask for overwriting existing shortcut
local strings for other languages
remove obsolete strings from localization files
Removed obsulete strings, translated russian strings
Merge branch 'better-key-change-message' of git://github.com/zhuochun/VimFx into zhuochun-better-key-change-message

Conflicts:
	extension/locale/ru/vimfx.properties