[X2Go-i18n] German translation for X2Goclient

Please note that Qtlinguist complained about the translation for "X.Org Server did not launch correctly after %n tries." It indicated different punctuation at the end of the line and a missing placeholder - even though the line was copy-pasted from the original, and then translated, leaving placeholder and punctuation in place. Not sure if this is a bug in Qtlinguist's checks, or if the file is actually broken somehow. Please verify before applying. Kind Regards, Stefan Baur -- BAUR-ITCS UG (haftungsbeschränkt) Geschäftsführer: Stefan Baur Eichenäckerweg 10, 89081 Ulm | Registergericht Ulm, HRB 724364 Fon/Fax 0731 40 34 66-36/-35 | USt-IdNr.: DE268653243