Code review comment for lp://qastaging/~deryck/launchpad/comment-button-capitalization-415253

This is a clean up branch to change 'Post comment' to 'Post Comment'.
See bug 415253.

This was undertaken while doing some template updates for 3.0, but I
moved it to its own branch given all the lines of tests that needed
updating.

= Launchpad lint =

Checking for conflicts. and issues in doctests and templates.
Running jslint, xmllint, pyflakes, and pylint.
Using normal rules.

Linting changed files:
  lib/lp/bugs/stories/bugattachments/xx-delete-bug-attachment.txt
  lib/lp/bugs/stories/bugattachments/xx-display-filesize-attachment.txt
  lib/lp/bugs/browser/bugmessage.py
  lib/lp/bugs/stories/bugs/80-add-comment.txt
  lib/lp/bugs/stories/bugs/xx-bug-comments-truncated.txt
  lib/lp/bugs/stories/bugs/xx-bug-hidden-comments.txt
  lib/lp/bugs/stories/bugs/xx-bug-activity.txt
  lib/lp/bugs/stories/bugattachments/40-search-bug-attachments.txt
  lib/lp/bugs/stories/bugs/xx-bug-comment-attach-file.txt
  lib/lp/bugs/stories/bugs/xx-add-comment-with-bugwatch-and-cve.txt
  lib/lp/bugs/stories/bugs/xx-incomplete-bugs.txt
  lib/lp/bugs/stories/bugattachments/10-add-bug-attachment.txt

lib/lp/bugs/stories/bugs/xx-add-comment-distribution-no-current-release.txt