Update translations from Transifex

Many thanks to:
 - cs: Vít Pelčák <vit@pelcak.org>
 - da: furyfire <frazzer@hotmail.com>
 - de: m4yer <m4yer+quassel@minad.de>, ToBeFree <tobias@freiwuppertal.de>, Heffer <felix@fetzig.org>
 - eo: cordata <tiffypet@yahoo.com>
 - fi: Larso <larso@gmx.com>
 - fr: Dorian <munto@free.fr>, GrecKo <gr3cko@gmail.com>
 - gl: Condex <elgomaisa@gmail.com>
 - hi: libregeekingkid <rajuvindane@gmail.com>
 - hu: ulysses <ulysses@kubuntu.org>
 - mr: libregeekingkid <rajuvindane@gmail.com>
 - nl: simonphilips <simon.philips@gmail.com>
 - oc: Cedric31 <cvalmary@yahoo.fr>
 - pl: derpella <matwa@poczta.pl>
 - pl: Marcin Jabrzyk <marcin.jabrzyk@gmail.com>
 - pt_BR: Pad <pedroaraujo@colorlesscube.com>
 - ro: roentgen <arthur.titeica@gmail.com>
 - sr: JovanJ <jovanjojkic@gmail.com>
 - tr: volkangezer <volkangezer@gmail.com>, zeugma <sunder67@hotmail.com>
 - uk: Yuri Chornoivan <yurchor@ukr.net>
 - zh_CN: leonfeng <rainofchaos@gmail.com>
mark string untranslatable
tx-sync.sh: try to pull first
transifex.net → .com
update quassel.pot