message: fix: made copy titles more consistent with other UIs
diff: {
  "command": "svn.itemlog.copymsg",
  "category": "SVN",
  - "title": "Copy message to clipboard"
  + "title": "Copy message"
  },
  {
  "command": "svn.itemlog.copyrevision",
  "category": "SVN",
  - "title": "Copy revision number to clipboard"
  + "title": "Copy revision number"
  },
  {
  "command": "svn.itemlog.openDiff",
  {
  "command": "svn.repolog.copymsg",
  "category": "SVN",
  - "title": "Copy message to clipboard"
  + "title": "Copy message"
  },
  {
  "command": "svn.repolog.copyrevision",
  "category": "SVN",
  - "title": "Copy revision number to clipboard"
  + "title": "Copy revision number"
  },
  {
  "command": "svn.repolog.openDiff",
  