diff --git a/git-gui.sh b/git-gui.sh
index 2d7a2a82ca..4682487ade 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -96,6 +96,10 @@ proc mc {fmt args} {
 	return [eval [list format $fmt] $args]
 }
 
+proc strcat {args} {
+	return [join $args {}]
+}
+
 ::msgcat::mcload $oguimsg
 unset oguimsg
 
@@ -540,7 +544,7 @@ if {![regsub {^git version } $_git_version {} _git_version]} {
 		-icon error \
 		-type ok \
 		-title [mc "git-gui: fatal error"] \
-		-message [append [mc "Cannot parse Git version string:"] "\n\n$_git_version"]
+		-message [strcat [mc "Cannot parse Git version string:"] "\n\n$_git_version"]
 	exit 1
 }
 
@@ -722,7 +726,7 @@ if {[catch {
 		set _prefix [git rev-parse --show-prefix]
 	} err]} {
 	catch {wm withdraw .}
-	error_popup [append [mc "Cannot find the git directory:"] "\n\n$err"]
+	error_popup [strcat [mc "Cannot find the git directory:"] "\n\n$err"]
 	exit 1
 }
 if {![file isdirectory $_gitdir] && [is_Cygwin]} {
@@ -730,26 +734,26 @@ if {![file isdirectory $_gitdir] && [is_Cygwin]} {
 }
 if {![file isdirectory $_gitdir]} {
 	catch {wm withdraw .}
-	error_popup [append [mc "Git directory not found:"] "\n\n$_gitdir"]
+	error_popup [strcat [mc "Git directory not found:"] "\n\n$_gitdir"]
 	exit 1
 }
 if {$_prefix ne {}} {
 	regsub -all {[^/]+/} $_prefix ../ cdup
 	if {[catch {cd $cdup} err]} {
 		catch {wm withdraw .}
-		error_popup [append [mc "Cannot move to top of working directory:"] "\n\n$err"]
+		error_popup [strcat [mc "Cannot move to top of working directory:"] "\n\n$err"]
 		exit 1
 	}
 	unset cdup
 } elseif {![is_enabled bare]} {
 	if {[lindex [file split $_gitdir] end] ne {.git}} {
 		catch {wm withdraw .}
-		error_popup [append [mc "Cannot use funny .git directory:"] "\n\n$_gitdir"]
+		error_popup [strcat [mc "Cannot use funny .git directory:"] "\n\n$_gitdir"]
 		exit 1
 	}
 	if {[catch {cd [file dirname $_gitdir]} err]} {
 		catch {wm withdraw .}
-		error_popup [append [mc "No working directory"] " [file dirname $_gitdir]:\n\n$err"]
+		error_popup [strcat [mc "No working directory"] " [file dirname $_gitdir]:\n\n$err"]
 		exit 1
 	}
 }
@@ -1658,7 +1662,7 @@ proc apply_config {} {
 				font configure $font $cn $cv
 			}
 			} err]} {
-			error_popup [append [mc "Invalid font specified in %s:" "gui.$name"] "\n\n$err"]
+			error_popup [strcat [mc "Invalid font specified in %s:" "gui.$name"] "\n\n$err"]
 		}
 		foreach {cn cv} [font configure $font] {
 			font configure ${font}bold $cn $cv
diff --git a/lib/blame.tcl b/lib/blame.tcl
index d14805e929..a911c3c77d 100644
--- a/lib/blame.tcl
+++ b/lib/blame.tcl
@@ -784,16 +784,16 @@ method _showcommit {cur_w lno} {
 		}
 
 		$w_cviewer insert end "commit $cmit\n" header_key
-		$w_cviewer insert end [append [mc "Author:"] "\t"] header_key
+		$w_cviewer insert end [strcat [mc "Author:"] "\t"] header_key
 		$w_cviewer insert end "$author_name $author_email" header_val
 		$w_cviewer insert end "  $author_time\n" header_val
 
-		$w_cviewer insert end [append [mc "Committer:"] "\t"] header_key
+		$w_cviewer insert end [strcat [mc "Committer:"] "\t"] header_key
 		$w_cviewer insert end "$committer_name $committer_email" header_val
 		$w_cviewer insert end "  $committer_time\n" header_val
 
 		if {$file ne $path} {
-			$w_cviewer insert end [append [mc "Original File:"] "\t"] header_key
+			$w_cviewer insert end [strcat [mc "Original File:"] "\t"] header_key
 			$w_cviewer insert end "[escape_path $file]\n" header_val
 		}
 
@@ -907,18 +907,18 @@ method _open_tooltip {cur_w} {
 		catch {set summary     $header($cmit,summary)}
 		catch {set author_time [foramt_date $header($cmit,author-time)]}
 
-		$tooltip_t insert end [append [mc "Originally By:"] "\n"] section_header
+		$tooltip_t insert end [strcat [mc "Originally By:"] "\n"] section_header
 		$tooltip_t insert end "commit $cmit\n"
 		$tooltip_t insert end "$author_name  $author_time\n"
 		$tooltip_t insert end "$summary\n"
 
 		if {$file ne $path} {
-			$tooltip_t insert end [append [mc "In File:"] " "] section_header
+			$tooltip_t insert end [strcat [mc "In File:"] " "] section_header
 			$tooltip_t insert end "$file\n"
 		}
 
 		$tooltip_t insert end "\n"
-		$tooltip_t insert end [append [mc "Copied Or Moved Here By:"] "\n"] section_header
+		$tooltip_t insert end [strcat [mc "Copied Or Moved Here By:"] "\n"] section_header
 		$tooltip_t insert end $save
 	}
 
diff --git a/lib/branch_rename.tcl b/lib/branch_rename.tcl
index d6f040e7a2..166538808f 100644
--- a/lib/branch_rename.tcl
+++ b/lib/branch_rename.tcl
@@ -114,7 +114,7 @@ method _rename {} {
 			-type ok \
 			-title [wm title $w] \
 			-parent $w \
-			-message [append [mc "Failed to rename '%s'." $oldname] "\n\n$err"]
+			-message [strcat [mc "Failed to rename '%s'." $oldname] "\n\n$err"]
 		return
 	}
 
diff --git a/lib/checkout_op.tcl b/lib/checkout_op.tcl
index a011044f90..f243966924 100644
--- a/lib/checkout_op.tcl
+++ b/lib/checkout_op.tcl
@@ -236,7 +236,7 @@ method _update_ref {} {
 		if {[catch {
 				git update-ref -m $reflog_msg $ref $new $cur
 			} err]} {
-			_error $this [append [mc "Failed to update '%s'." $newbranch] "\n\n$err"]
+			_error $this [strcat [mc "Failed to update '%s'." $newbranch] "\n\n$err"]
 			return 0
 		}
 	}
@@ -351,7 +351,7 @@ method _readtree_wait {fd} {
 		set err $readtree_d
 		regsub {^fatal: } $err {} err
 		$::main_status stop [mc "Aborted checkout of '%s' (file level merging is required)." [_name $this]]
-		warn_popup [append [mc "File level merge required."] "
+		warn_popup [strcat [mc "File level merge required."] "
 
 $err
 
@@ -575,7 +575,7 @@ method _toplevel {title} {
 }
 
 method _fatal {err} {
-	error_popup [append [mc "Failed to set current branch.
+	error_popup [strcat [mc "Failed to set current branch.
 
 This working directory is only partially switched.  We successfully updated your files, but failed to update an internal Git file.
 
diff --git a/lib/choose_rev.tcl b/lib/choose_rev.tcl
index 5e833a5376..a063c5bc49 100644
--- a/lib/choose_rev.tcl
+++ b/lib/choose_rev.tcl
@@ -314,7 +314,7 @@ method commit_or_die {} {
 		}
 
 		set top [winfo toplevel $w]
-		set msg [append [mc "Invalid revision: %s" [get $this]] "\n\n$err"]
+		set msg [strcat [mc "Invalid revision: %s" [get $this]] "\n\n$err"]
 		tk_messageBox \
 			-icon error \
 			-type ok \
diff --git a/lib/commit.tcl b/lib/commit.tcl
index a037c4f7d0..7099f5c6f7 100644
--- a/lib/commit.tcl
+++ b/lib/commit.tcl
@@ -46,7 +46,7 @@ You are currently in the middle of a merge that has not been fully completed.  Y
 			}
 			set msg [string trim $msg]
 		} err]} {
- 	    error_popup [append [mc "Error loading commit data for amend:"] "\n\n$err"]
+		error_popup [strcat [mc "Error loading commit data for amend:"] "\n\n$err"]
 		return
 	}
 
@@ -73,12 +73,12 @@ proc committer_ident {} {
 
 	if {$GIT_COMMITTER_IDENT eq {}} {
 		if {[catch {set me [git var GIT_COMMITTER_IDENT]} err]} {
-			error_popup [append [mc "Unable to obtain your identity:"] "\n\n$err"]
+			error_popup [strcat [mc "Unable to obtain your identity:"] "\n\n$err"]
 			return {}
 		}
 		if {![regexp {^(.*) [0-9]+ [-+0-9]+$} \
 			$me me GIT_COMMITTER_IDENT]} {
-			error_popup [append [mc "Invalid GIT_COMMITTER_IDENT:"] "\n\n$me"]
+			error_popup [strcat [mc "Invalid GIT_COMMITTER_IDENT:"] "\n\n$me"]
 			return {}
 		}
 	}
@@ -254,7 +254,7 @@ proc commit_committree {fd_wt curHEAD msg} {
 
 	gets $fd_wt tree_id
 	if {$tree_id eq {} || [catch {close $fd_wt} err]} {
-		error_popup [append [mc "write-tree failed:"] "\n\n$err"]
+		error_popup [strcat [mc "write-tree failed:"] "\n\n$err"]
 		ui_status {Commit failed.}
 		unlock_index
 		return
@@ -314,7 +314,7 @@ A rescan will be automatically started now.
 	}
 	lappend cmd <$msg_p
 	if {[catch {set cmt_id [eval git $cmd]} err]} {
-		error_popup [append [mc "commit-tree failed:"] "\n\n$err"]
+		error_popup [strcat [mc "commit-tree failed:"] "\n\n$err"]
 		ui_status {Commit failed.}
 		unlock_index
 		return
@@ -336,7 +336,7 @@ A rescan will be automatically started now.
 	if {[catch {
 			git update-ref -m $reflogm HEAD $cmt_id $curHEAD
 		} err]} {
-		error_popup [append [mc "update-ref failed:"] "\n\n$err"]
+		error_popup [strcat [mc "update-ref failed:"] "\n\n$err"]
 		ui_status {Commit failed.}
 		unlock_index
 		return
diff --git a/lib/diff.tcl b/lib/diff.tcl
index c2ae4555fe..43565e412f 100644
--- a/lib/diff.tcl
+++ b/lib/diff.tcl
@@ -112,7 +112,7 @@ proc show_diff {path w {lno {}}} {
 			set diff_active 0
 			unlock_index
 			ui_status [mc "Unable to display %s" [escape_path $path]]
- 		    error_popup [append [mc "Error loading file:"] "\n\n$err"]
+			error_popup [strcat [mc "Error loading file:"] "\n\n$err"]
 			return
 		}
 		$ui_diff conf -state normal
@@ -182,7 +182,7 @@ proc show_diff {path w {lno {}}} {
 		set diff_active 0
 		unlock_index
 		ui_status [mc "Unable to display %s" [escape_path $path]]
-		error_popup [append [mc "Error loading diff:"] "\n\n$err"]
+		error_popup [strcat [mc "Error loading diff:"] "\n\n$err"]
 		return
 	}
 
diff --git a/lib/option.tcl b/lib/option.tcl
index 03bc08f128..12e297971a 100644
--- a/lib/option.tcl
+++ b/lib/option.tcl
@@ -308,7 +308,7 @@ proc do_restore_defaults {} {
 
 proc do_save_config {w} {
 	if {[catch {save_config} err]} {
-		error_popup [append [mc "Failed to completely save options:"] "\n\n$err"]
+		error_popup [strcat [mc "Failed to completely save options:"] "\n\n$err"]
 	}
 	reshow_diff
 	destroy $w
diff --git a/lib/shortcut.tcl b/lib/shortcut.tcl
index d0e63a3d0e..a7674a7aee 100644
--- a/lib/shortcut.tcl
+++ b/lib/shortcut.tcl
@@ -23,7 +23,7 @@ proc do_windows_shortcut {} {
 				puts $fd " \"[file normalize $argv0]\""
 				close $fd
 			} err]} {
-			error_popup [append [mc "Cannot write script:"] "\n\n$err"]
+			error_popup [strcat [mc "Cannot write script:"] "\n\n$err"]
 		}
 	}
 }
@@ -71,7 +71,7 @@ proc do_cygwin_shortcut {} {
 				puts $fd " &\""
 				close $fd
 			} err]} {
-			error_popup [append [mc "Cannot write script:"] "\n\n$err"]
+			error_popup [strcat [mc "Cannot write script:"] "\n\n$err"]
 		}
 	}
 }
@@ -146,7 +146,7 @@ proc do_macosx_app {} {
 
 				file attributes $exe -permissions u+x,g+x,o+x
 			} err]} {
-			error_popup [append [mc "Cannot write icon:"] "\n\n$err"]
+			error_popup [strcat [mc "Cannot write icon:"] "\n\n$err"]
 		}
 	}
 }