gitk: Mark forgotten strings (header sentence parts in color chooser) for translation

Signed-off-by: Paul Mackerras <paulus@samba.org>

gitk

@@ -10140,26 +10140,26 @@ proc doprefs {} {
     grid $top.cdisp - -sticky w -pady 10
     label $top.bg -padx 40 -relief sunk -background $bgcolor
     button $top.bgbut -text [mc "Background"] -font optionfont \
-	-command [list choosecolor bgcolor {} $top.bg background setbg]
+	-command [list choosecolor bgcolor {} $top.bg [mc "background"] setbg]
     grid x $top.bgbut $top.bg -sticky w
     label $top.fg -padx 40 -relief sunk -background $fgcolor
     button $top.fgbut -text [mc "Foreground"] -font optionfont \
-	-command [list choosecolor fgcolor {} $top.fg foreground setfg]
+	-command [list choosecolor fgcolor {} $top.fg [mc "foreground"] setfg]
     grid x $top.fgbut $top.fg -sticky w
     label $top.diffold -padx 40 -relief sunk -background [lindex $diffcolors 0]
     button $top.diffoldbut -text [mc "Diff: old lines"] -font optionfont \
-	-command [list choosecolor diffcolors 0 $top.diffold "diff old lines" \
+	-command [list choosecolor diffcolors 0 $top.diffold [mc "diff old lines"] \
 		      [list $ctext tag conf d0 -foreground]]
     grid x $top.diffoldbut $top.diffold -sticky w
     label $top.diffnew -padx 40 -relief sunk -background [lindex $diffcolors 1]
     button $top.diffnewbut -text [mc "Diff: new lines"] -font optionfont \
-	-command [list choosecolor diffcolors 1 $top.diffnew "diff new lines" \
+	-command [list choosecolor diffcolors 1 $top.diffnew [mc "diff new lines"] \
 		      [list $ctext tag conf dresult -foreground]]
     grid x $top.diffnewbut $top.diffnew -sticky w
     label $top.hunksep -padx 40 -relief sunk -background [lindex $diffcolors 2]
     button $top.hunksepbut -text [mc "Diff: hunk header"] -font optionfont \
 	-command [list choosecolor diffcolors 2 $top.hunksep \
-		      "diff hunk header" \
+		      [mc "diff hunk header"] \
 		      [list $ctext tag conf hunksep -foreground]]
     grid x $top.hunksepbut $top.hunksep -sticky w
     label $top.markbgsep -padx 40 -relief sunk -background $markbgcolor
@@ -10170,7 +10170,7 @@ proc doprefs {} {
     grid x $top.markbgbut $top.markbgsep -sticky w
     label $top.selbgsep -padx 40 -relief sunk -background $selectbgcolor
     button $top.selbgbut -text [mc "Select bg"] -font optionfont \
-	-command [list choosecolor selectbgcolor {} $top.selbgsep background setselbg]
+	-command [list choosecolor selectbgcolor {} $top.selbgsep [mc "background"] setselbg]
     grid x $top.selbgbut $top.selbgsep -sticky w
 
     label $top.cfont -text [mc "Fonts: press to choose"]