TortoiseShell: Hide "Last Modified" label when we do not load that information

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Fixed issue #1832: TortoiseGitMerge has an empty menue when German language pack is loaded

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Mitigate sys$command file problem on cloning

Signed-off-by: Sven Strickroth <email@cs-ware.de>

(updates issue #1011)
Added mitigation and remove sys$command file after svn cloning on our own until msysgit fixes this issue.
Replace TortoiseMerge with TortoiseGitMerge in documentation

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Replace TortoiseIDiff with TortoiseGitIDiff

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Replace TortoiseBlame with TortoiseGitBlame

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>