Mark strings for translation.

The procedure [mc ...] will translate the strings through msgcat.
Strings must be enclosed in quotes, not in braces, because otherwise
xgettext cannot extract them properly, although on the Tcl side both
delimiters would work fine.

[jes: I merged the later patches to that end.]

Signed-off-by: Christian Stimming <stimming@tuhh.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

lib/branch_checkout.tcl

@@ -11,37 +11,37 @@ field opt_detach    0; # force a detached head case?
 
 constructor dialog {} {
 	make_toplevel top w
-	wm title $top "[appname] ([reponame]): Checkout Branch"
+	wm title $top [append "[appname] ([reponame]): " [mc "Checkout Branch"]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 	}
 
-	label $w.header -text {Checkout Branch} -font font_uibold
+	label $w.header -text [mc "Checkout Branch"] -font font_uibold
 	pack $w.header -side top -fill x
 
 	frame $w.buttons
-	button $w.buttons.create -text Checkout \
+	button $w.buttons.create -text [mc Checkout] \
 		-default active \
 		-command [cb _checkout]
 	pack $w.buttons.create -side right
-	button $w.buttons.cancel -text {Cancel} \
+	button $w.buttons.cancel -text [mc Cancel] \
 		-command [list destroy $w]
 	pack $w.buttons.cancel -side right -padx 5
 	pack $w.buttons -side bottom -fill x -pady 10 -padx 10
 
-	set w_rev [::choose_rev::new $w.rev {Revision}]
+	set w_rev [::choose_rev::new $w.rev [mc Revision]]
 	$w_rev bind_listbox <Double-Button-1> [cb _checkout]
 	pack $w.rev -anchor nw -fill both -expand 1 -pady 5 -padx 5
 
-	labelframe $w.options -text {Options}
+	labelframe $w.options -text [mc Options]
 
 	checkbutton $w.options.fetch \
-		-text {Fetch Tracking Branch} \
+		-text [mc "Fetch Tracking Branch"] \
 		-variable @opt_fetch
 	pack $w.options.fetch -anchor nw
 
 	checkbutton $w.options.detach \
-		-text {Detach From Local Branch} \
+		-text [mc "Detach From Local Branch"] \
 		-variable @opt_detach
 	pack $w.options.detach -anchor nw