diff --git a/lib/blame.tcl b/lib/blame.tcl
index b1d15f4621..a1aeb8b96e 100644
--- a/lib/blame.tcl
+++ b/lib/blame.tcl
@@ -70,7 +70,7 @@ constructor new {i_commit i_path i_jump} {
 	set path   $i_path
 
 	make_toplevel top w
-	wm title $top [append "[appname] ([reponame]): " [mc "File Viewer"]]
+	wm title $top [mc "%s (%s): File Viewer" [appname] [reponame]]
 
 	set font_w [font measure font_diff "0"]
 
diff --git a/lib/branch_checkout.tcl b/lib/branch_checkout.tcl
index 2e459a8297..d06037decc 100644
--- a/lib/branch_checkout.tcl
+++ b/lib/branch_checkout.tcl
@@ -13,7 +13,7 @@ constructor dialog {} {
 	global use_ttk NS
 	make_dialog top w
 	wm withdraw $w
-	wm title $top [append "[appname] ([reponame]): " [mc "Checkout Branch"]]
+	wm title $top [mc "%s (%s): Checkout Branch" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 	}
diff --git a/lib/branch_create.tcl b/lib/branch_create.tcl
index 4bb907705c..ba367d551d 100644
--- a/lib/branch_create.tcl
+++ b/lib/branch_create.tcl
@@ -20,7 +20,7 @@ constructor dialog {} {
 
 	make_dialog top w
 	wm withdraw $w
-	wm title $top [append "[appname] ([reponame]): " [mc "Create Branch"]]
+	wm title $top [mc "%s (%s): Create Branch" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 	}
diff --git a/lib/branch_delete.tcl b/lib/branch_delete.tcl
index 9aef0c931b..a5051637bb 100644
--- a/lib/branch_delete.tcl
+++ b/lib/branch_delete.tcl
@@ -13,7 +13,7 @@ constructor dialog {} {
 
 	make_dialog top w
 	wm withdraw $w
-	wm title $top [append "[appname] ([reponame]): " [mc "Delete Branch"]]
+	wm title $top [mc "%s (%s): Delete Branch" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 	}
diff --git a/lib/branch_rename.tcl b/lib/branch_rename.tcl
index 6e510ec2e3..3a2d79a9cc 100644
--- a/lib/branch_rename.tcl
+++ b/lib/branch_rename.tcl
@@ -12,7 +12,7 @@ constructor dialog {} {
 
 	make_dialog top w
 	wm withdraw $w
-	wm title $top [append "[appname] ([reponame]): " [mc "Rename Branch"]]
+	wm title $top [mc "%s (%s): Rename Branch" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 	}
diff --git a/lib/browser.tcl b/lib/browser.tcl
index 0328338fda..158049353f 100644
--- a/lib/browser.tcl
+++ b/lib/browser.tcl
@@ -24,7 +24,7 @@ constructor new {commit {path {}}} {
 	global cursor_ptr M1B use_ttk NS
 	make_dialog top w
 	wm withdraw $top
-	wm title $top [append "[appname] ([reponame]): " [mc "File Browser"]]
+	wm title $top [mc "%s (%s): File Browser" [appname] [reponame]]
 
 	if {$path ne {}} {
 		if {[string index $path end] ne {/}} {
@@ -272,7 +272,7 @@ constructor dialog {} {
 	global use_ttk NS
 	make_dialog top w
 	wm withdraw $top
-	wm title $top [append "[appname] ([reponame]): " [mc "Browse Branch Files"]]
+	wm title $top [mc "%s (%s): Browse Branch Files" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 		wm transient $top .
diff --git a/lib/database.tcl b/lib/database.tcl
index 8bd4b8e2f8..85783081e0 100644
--- a/lib/database.tcl
+++ b/lib/database.tcl
@@ -63,7 +63,7 @@ proc do_stats {} {
 	bind $w <Visibility> "grab $w; focus $w.buttons.close"
 	bind $w <Key-Escape> [list destroy $w]
 	bind $w <Key-Return> [list destroy $w]
-	wm title $w [append "[appname] ([reponame]): " [mc "Database Statistics"]]
+	wm title $w [mc "%s (%s): Database Statistics" [appname] [reponame]]
 	wm deiconify $w
 	tkwait window $w
 }
diff --git a/lib/diff.tcl b/lib/diff.tcl
index 30bdd691ee..4cae10a4c7 100644
--- a/lib/diff.tcl
+++ b/lib/diff.tcl
@@ -223,10 +223,9 @@ proc show_other_diff {path w m cont_info} {
 		}
 		$ui_diff conf -state normal
 		if {$type eq {submodule}} {
-			$ui_diff insert end [append \
-				"* " \
-				[mc "Git Repository (subproject)"] \
-				"\n"] d_info
+			$ui_diff insert end \
+				"* [mc "Git Repository (subproject)"]\n" \
+				d_info
 		} elseif {![catch {set type [exec file $path]}]} {
 			set n [string length $path]
 			if {[string equal -length $n $path $type]} {
@@ -611,7 +610,7 @@ proc apply_hunk {x y} {
 		puts -nonewline $p $current_diff_header
 		puts -nonewline $p [$ui_diff get $s_lno $e_lno]
 		close $p} err]} {
-		error_popup [append $failed_msg "\n\n$err"]
+		error_popup "$failed_msg\n\n$err"
 		unlock_index
 		return
 	}
@@ -829,7 +828,7 @@ proc apply_range_or_line {x y} {
 		puts -nonewline $p $current_diff_header
 		puts -nonewline $p $wholepatch
 		close $p} err]} {
-		error_popup [append $failed_msg "\n\n$err"]
+		error_popup "$failed_msg\n\n$err"
 	}
 
 	unlock_index
diff --git a/lib/error.tcl b/lib/error.tcl
index 9b7d2294ba..71dc8601d1 100644
--- a/lib/error.tcl
+++ b/lib/error.tcl
@@ -17,7 +17,7 @@ proc error_popup {msg} {
 	set cmd [list tk_messageBox \
 		-icon error \
 		-type ok \
-		-title [append "$title: " [mc "error"]] \
+		-title [mc "%s: error" $title] \
 		-message $msg]
 	if {[winfo ismapped [_error_parent]]} {
 		lappend cmd -parent [_error_parent]
@@ -33,7 +33,7 @@ proc warn_popup {msg} {
 	set cmd [list tk_messageBox \
 		-icon warning \
 		-type ok \
-		-title [append "$title: " [mc "warning"]] \
+		-title [mc "%s: warning" $title] \
 		-message $msg]
 	if {[winfo ismapped [_error_parent]]} {
 		lappend cmd -parent [_error_parent]
diff --git a/lib/merge.tcl b/lib/merge.tcl
index 5ab6f8f102..2b10a98389 100644
--- a/lib/merge.tcl
+++ b/lib/merge.tcl
@@ -144,7 +144,7 @@ constructor dialog {} {
 	}
 
 	make_dialog top w
-	wm title $top [append "[appname] ([reponame]): " [mc "Merge"]]
+	wm title $top [mc "%s (%s): Merge" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 	}
diff --git a/lib/remote_add.tcl b/lib/remote_add.tcl
index 50029d0cee..480a6b30d0 100644
--- a/lib/remote_add.tcl
+++ b/lib/remote_add.tcl
@@ -17,7 +17,7 @@ constructor dialog {} {
 
 	make_dialog top w
 	wm withdraw $top
-	wm title $top [append "[appname] ([reponame]): " [mc "Add Remote"]]
+	wm title $top [mc "%s (%s): Add Remote" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 	}
diff --git a/lib/remote_branch_delete.tcl b/lib/remote_branch_delete.tcl
index fcc06d03a1..5ba9fcadd1 100644
--- a/lib/remote_branch_delete.tcl
+++ b/lib/remote_branch_delete.tcl
@@ -26,7 +26,7 @@ constructor dialog {} {
 	global all_remotes M1B use_ttk NS
 
 	make_dialog top w
-	wm title $top [append "[appname] ([reponame]): " [mc "Delete Branch Remotely"]]
+	wm title $top [mc "%s (%s): Delete Branch Remotely" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 	}
diff --git a/lib/shortcut.tcl b/lib/shortcut.tcl
index 39d23f96df..97d1d7aa02 100644
--- a/lib/shortcut.tcl
+++ b/lib/shortcut.tcl
@@ -5,7 +5,7 @@ proc do_windows_shortcut {} {
 	global _gitworktree
 	set fn [tk_getSaveFile \
 		-parent . \
-		-title [append "[appname] ([reponame]): " [mc "Create Desktop Icon"]] \
+		-title [mc "%s (%s): Create Desktop Icon" [appname] [reponame]] \
 		-initialfile "Git [reponame].lnk"]
 	if {$fn != {}} {
 		if {[file extension $fn] ne {.lnk}} {
@@ -40,7 +40,7 @@ proc do_cygwin_shortcut {} {
 	}
 	set fn [tk_getSaveFile \
 		-parent . \
-		-title [append "[appname] ([reponame]): " [mc "Create Desktop Icon"]] \
+		-title [mc "%s (%s): Create Desktop Icon" [appname] [reponame]] \
 		-initialdir $desktop \
 		-initialfile "Git [reponame].lnk"]
 	if {$fn != {}} {
@@ -72,7 +72,7 @@ proc do_macosx_app {} {
 
 	set fn [tk_getSaveFile \
 		-parent . \
-		-title [append "[appname] ([reponame]): " [mc "Create Desktop Icon"]] \
+		-title [mc "%s (%s): Create Desktop Icon" [appname] [reponame]] \
 		-initialdir [file join $env(HOME) Desktop] \
 		-initialfile "Git [reponame].app"]
 	if {$fn != {}} {
diff --git a/lib/tools_dlg.tcl b/lib/tools_dlg.tcl
index 7eeda9daf2..c05413ce43 100644
--- a/lib/tools_dlg.tcl
+++ b/lib/tools_dlg.tcl
@@ -19,7 +19,7 @@ constructor dialog {} {
 	global repo_config use_ttk NS
 
 	make_dialog top w
-	wm title $top [append "[appname] ([reponame]): " [mc "Add Tool"]]
+	wm title $top [mc "%s (%s): Add Tool" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 		wm transient $top .
@@ -184,7 +184,7 @@ constructor dialog {} {
 	load_config 1
 
 	make_dialog top w
-	wm title $top [append "[appname] ([reponame]): " [mc "Remove Tool"]]
+	wm title $top [mc "%s (%s): Remove Tool" [appname] [reponame]]
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 		wm transient $top .
@@ -280,7 +280,7 @@ constructor dialog {fullname} {
 	}
 
 	make_dialog top w -autodelete 0
-	wm title $top [append "[appname] ([reponame]): " $title]
+	wm title $top "[mc "%s (%s):" [appname] [reponame]] $title"
 	if {$top ne {.}} {
 		wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 		wm transient $top .
diff --git a/lib/transport.tcl b/lib/transport.tcl
index e5d211edea..a1a424aab5 100644
--- a/lib/transport.tcl
+++ b/lib/transport.tcl
@@ -226,7 +226,7 @@ proc do_push_anywhere {} {
 	bind $w <Visibility> "grab $w; focus $w.buttons.create"
 	bind $w <Key-Escape> "destroy $w"
 	bind $w <Key-Return> [list start_push_anywhere_action $w]
-	wm title $w [append "[appname] ([reponame]): " [mc "Push"]]
+	wm title $w [mc "%s (%s): Push" [appname] [reponame]]
 	wm deiconify $w
 	tkwait window $w
 }