(Bug 5026) Don't hardcode the "---Original Message---" text

This seems a reasonable enough pattern to match against. Switching to a
pattern so that it doesn't matter what language it is.
(Bug 5034) Allow up to five authorized emails

Up from three
Merge pull request #371 from afuna/authorized-emails-bug5034

(Bug 5034) Allow up to five authorized emails
Merge pull request #368 from afuna/dashdashdash-terminator-bug5026

(Bug 5026) Don't hardcode the "---Original Message---" text
(Bug 5026) Clean out more cruft

* "On 29 Apr 2013" near the end of the message
* "--- .... <dw_null@dreamwidth.org>" anywhere in the message
Merge pull request #377 from afuna/more-header-formats-bug5026

(Bug 5026) Clean out more cruft
Merge pull request #375 from ninetyd/release-1.15

Bug 5038 - Contextual popup has unreadable font color in some site skins...