Paged change details: Rename 'Commit Message' tab to 'Commit'

This saves space in the tab strip. Also it is planned to add other
commit information to this tab.

Change-Id: I941ac15b91d75c5602d4ba95c10c3c6bbed31430
Signed-off-by: Edwin Kempin <ekempin@google.com>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d512166..5ad8715 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -251,7 +251,7 @@
   <string name="more_description">More Actions Menu</string>
 
   <!-- CommitMessageFragment -->
-  <string name="commit_message_title">Commit Message</string>
+  <string name="commit_message_title">Commit</string>
 
   <!-- FileListFragment -->
   <string name="file_list_title">Files</string>