Updated Greek translation
Make 'Copy Link Location' copy into both primary and selection clipboards

It used to copy the link into both buffers, same as the 'Copy Email Address"
does, but it seems, after a move to WebKit based message preview, this
changed and the link had been copied only to the selection clipboard.
Make the function consistent and copy the link into to both clipboards.
[EActivityBar] Reset priv->timeout_id when the timeout is reached

Since GLib begun to claim about incorrect ids being passed to
g_source_remove(), a problem with EActivityBar had been discovered,
it doesn't unset its priv->timeout_id when the timeout is reached,
which leads to the new runtime warnings from GLib.
Updated Greek translation
Fix various memory leaks
Leftover "Generating message list..." info in a message-list

In some cases, like on errors or cancel, there could be left
an information in the message-list that the list is generating
its content, while it didn't do it in reality. This always resets
the message-list information in case the current message-list
generation finished and was the last in the queue.