Second half of revert of toolbar button size: Refs bgo#723578

This code must also remain, as it deals with situations where
spacers are placed before or after the linked buttons.
Fixed revert in last commit

Code was added, not replaced.
Can't press A or Delete to archive/trash message: Closes bgo#721789

If compiled with the GDK binding fix in Vala 0.23.2 (bgo#713240), this
patch fixes the accelerator problem.

Tip o' the hat to Charles, who pointed out the accelerators.ui file.
Update copyrights to 2014: Closes bgo#722381
Updated POTFILES.in
Updated Polish translation
Added Serbian translation
Further fixes to the background flag watcher

The "enabled" property is no longer used, so removing.

If the flag watcher is cancelled (because the folder has been closed),
the watcher was still rescheduling another polling loop.  This patch
prevents that.
Fix regex for restoring quotes in plain text construction

The character following the token is found through a look-ahead, to
avoid consuming the opening of the next token.  (There should be
newlines separating tokens, but in some poorly understood circumstances,
this doesn't happen.)  We don't use a look-behind at the beginning, so
that the second consecutive token doesn't insert a second newline
between the two.  (The first of the pair already gave us one.)

Closes: bgo #723742
Updated Galician translations
Updated Czech translation
Updated Ukranian
Conversation list respects selection palette: Closes bgo#723265

Now when a conversation list element is selected, the text colors
match the theme's selection colors.
Prompt before deleting messages

Closes: bgo #713875
Updated Polish translation
Better special folder detection/creation

This looks for some translatable common names for special folders like
Sent Mail, Drafts, Spam and Trash, instead of only relying on the
server's special-use or xlist extensions.  If the server doesn't report
special-use/xlist, we look for common folder names, creating them on the
server if necessary, so we always have folders necessary for tasks like
saving drafts or sent mail.

Closes: bgo #713492
Updated Polish translation
Avoid extra empty lines in plain quoted text: Closes bgo#723815

Blank lines appear unpredictably in blockquoted text, but would
like to avoid displaying them.
Use sym. icons for read/unread starred/unstarred mail: Refs bgo#720771
Updated Czech translation