EMailReader cleanups.
Bug 706463 - Refcounting error in e_mail_reader_reply_to_message()

Highlight a section of a mailing list post, click Reply, answer "Reply
Privately", Evolution mishandles the source message's reference count,
causing the message to finalize too early and crash in Camel.
Update French translation
Update French translation
User docs: Mark images without text as non-translatable. Bug #706596
User docs: Garrrrrr. Fix typos.
User docs: Remove link to external 404 page
User docs: Fix a 404 link
Bug #659715 - Reject folder copy/move in offline
Bug #658164 - Pressing the "Make this Occurrence Movable" changes meeting time
Updated Galician translations
Updated Lithuanian translation
Bug #706814 - Do not use folder uri in copy/move folder errors
Skip evolution from 'Open with' list of applications on attachments
Bug #706901 - Large default book slows down composer open
Adding new strings to copy/move event/task/memo and handle possible errors on those operations
Updated Brazilian Portuguese translation
Updated Slovenian translation
Bug 707043 - Audio attachment not shown correctly
EMailDisplay: Remove bind_iframe_content_visibility().

None of my attachment samples invoke bind_iframe_content_visibility().
Both it and toggle_widget_visibility() appear to dead code.  Removing
the functions causes no ill side-effects as far as I can tell.