git-gui: Bind Cmd-, to Preferences on Mac OS X

A Mac OS X UI convention is to have Cmd-, be the accelerator key
for the preferences window, which by convention is located in the
apple menu under a separator below the about command.  We also now
call this "Preferences..." as that is the conventional term used
in English.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -2018,8 +2018,12 @@ if {[is_MacOSX]} {
 
 	.mbar.apple add command -label [mc "About %s" [appname]] \
 		-command do_about
-	.mbar.apple add command -label [mc "Options..."] \
-		-command do_options
+	.mbar.apple add separator
+	.mbar.apple add command \
+		-label [mc "Preferences..."] \
+		-command do_options \
+		-accelerator $M1T-,
+	bind . <$M1B-,> do_options
 } else {
 	# -- Edit Menu
 	#

lib/option.tcl

@@ -78,10 +78,6 @@ proc do_options {} {
 	toplevel $w
 	wm geometry $w "+[winfo rootx .]+[winfo rooty .]"
 
-	label $w.header -text [mc "Options"] \
-		-font font_uibold
-	pack $w.header -side top -fill x
-
 	frame $w.buttons
 	button $w.buttons.restore -text [mc "Restore Defaults"] \
 		-default normal \
@@ -199,7 +195,13 @@ proc do_options {} {
 	bind $w <Visibility> "grab $w; focus $w.buttons.save"
 	bind $w <Key-Escape> "destroy $w"
 	bind $w <Key-Return> [list do_save_config $w]
-	wm title $w [append "[appname] ([reponame]): " [mc "Options"]]
+
+	if {[is_MacOSX]} {
+		set t [mc "Preferences"]
+	} else {
+		set t [mc "Options"]
+	}
+	wm title $w "[appname] ([reponame]): $t"
 	tkwait window $w
 }