gitk: UI text: change "SHA1 ID" to "Commit ID"

SHA1 might not stay forever, and plans to use SHA256 already exist,
so use the official name for it - "Commit ID".

Only visible UI texts are modified to reduce the noise when using
git-blame, while comments and variable names still contain SHA1/sha1.

Signed-off-by: Avi Halachmi (:avih) <avihpit@yahoo.com>

gitk

@@ -2223,7 +2223,7 @@ proc makewindow {} {
     set sha1entry .tf.bar.sha1
     set entries $sha1entry
     set sha1but .tf.bar.sha1label
-    button $sha1but -text "[mc "SHA1 ID:"] " -state disabled -relief flat \
+    button $sha1but -text "[mc "Commit ID:"] " -state disabled -relief flat \
         -command gotocommit -width 8
     $sha1but conf -disabledforeground [$sha1but cget -foreground]
     pack .tf.bar.sha1label -side left
@@ -8756,7 +8756,7 @@ proc sha1change {n1 n2 op} {
     if {$state == "normal"} {
         $sha1but conf -state normal -relief raised -text "[mc "Goto:"] "
     } else {
-        $sha1but conf -state disabled -relief flat -text "[mc "SHA1 ID:"] "
+        $sha1but conf -state disabled -relief flat -text "[mc "Commit ID:"] "
     }
 }
 
@@ -8775,7 +8775,7 @@ proc gotocommit {} {
             set matches [longid $id]
             if {$matches ne {}} {
                 if {[llength $matches] > 1} {
-                    error_popup [mc "Short SHA1 id %s is ambiguous" $id]
+                    error_popup [mc "Short commit ID %s is ambiguous" $id]
                     return
                 }
                 set id [lindex $matches 0]
@@ -8792,7 +8792,7 @@ proc gotocommit {} {
         return
     }
     if {[regexp {^[0-9a-fA-F]{4,}$} $sha1string]} {
-        set msg [mc "SHA1 id %s is not known" $sha1string]
+        set msg [mc "Commit ID %s is not known" $sha1string]
     } else {
         set msg [mc "Revision %s is not in the current view" $sha1string]
     }
@@ -11594,7 +11594,7 @@ proc prefspage_general {notebook} {
     ${NS}::checkbutton $page.showlocal -text [mc "Show local changes"] \
         -variable showlocalchanges
     grid x $page.showlocal -sticky w
-    ${NS}::checkbutton $page.autoselect -text [mc "Auto-select SHA1 (length)"] \
+    ${NS}::checkbutton $page.autoselect -text [mc "Auto-select commit ID (length)"] \
         -variable autoselect
     spinbox $page.autosellen -from 1 -to 40 -width 4 -textvariable autosellen
     grid x $page.autoselect $page.autosellen -sticky w