[evolution] New strings added, composer UI slightly changed

[Milan Crha <mcrha redhat com>]

        Hi,
after an approval [1] I committed [2] change for bug #237917 [3] and 
filled bug #745154 [4] for use documentation update. The commit [2] 
adds new translatable strings and changes new message composer UI 
slightly. Check View->From field override to see the change.
        Bye,
        Milan

[1] 
https://mail.gnome.org/archives/release-team/2015-February/msg00050.html
[2] https://git.gnome.org/browse/evolution/commit/?id=4d7188d
[3] https://bugzilla.gnome.org/show_bug.cgi?id=237917
[4] https://bugzilla.gnome.org/show_bug.cgi?id=745154