[Localization] Updating translations by e-mail

[scootergrisen]

This line on http://wiki.qt.io/Qt_Localization could be improved:

"In case you really cannot find your way through git/Gerrit and cannot 
find someone to help you, you may contribute via email after accepting 
the CLA on Gerrit."

[contribute via email] could be a mailto link or something so people 
know where to submit.

[CLA] could have an explanation.
Like HTML <abbr title="Cats Loves Ass">CLA</abbr>
So the user can hover the cursor and see what CLA stands for.

[Gerrit] could be a link so the user knows where to register without 
having to look for other links on the page.



Same with "#qt-labs and #qt-creator channels on irc.freenode.net"

<a href="irc://irc.freenode.net/qt-labs">#qt-labs</a>
<a href="irc://irc.freenode.net/qt-creator">#qt-creator</a>