Missing translations and i18n support

By module

Admin

• For Priorities, Ticket Types, Resolutions, Severities:
  • Note that for Milestones and Versions the template file contains separate messages, so they are translatable.

Milestone

• In view milestone and in roadmap, the "Active" and "Closed" words (referring the ticket counts) are not translatable.

Ticket

• The "comment" in "comment:N" permalink.

Reports

• "Ticket" and "Created" headers in the reports table.

Unnecessary strings

This strings probably unchanged in all translations:

#: trac/templates/about.html:38
msgid "COPYING"

#: trac/templates/about.html:44
msgid "http://trac.edgewall.org/"

#: trac/templates/error.html:227
msgid "TracGuide"

(rblank) I don't know if we can actually prevent those from being extracted from templates.