Add a "replace" and a "replace all" button to the TMerge find dialog

Based on TortoiseSVN revisions #25531, #25533, #25536, and #25537.

(fixes issue #1970)

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

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Allow to replace with empty string, and disable replace textbox and buttons when they should

Based on TortoiseSVN revision 25538, 25540

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
TortoiseGit's find combox is case sensitive, so replace combobox should also be

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

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Merge branch 'tmerge-replace'