i18n: update translations

- update list of source files
- update source .pot file
- fetch updated translations

Change-Id: I73271f76773163c78a843318455b77f55c376084
Reviewed-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 073ce21..849c452 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -21,6 +21,7 @@
 src/ring_client_options.c
 src/ringmainwindow.cpp
 src/ringwelcomeview.cpp
+src/usernameregistrationbox.cpp
 src/native/dbuserrorhandler.cpp
 src/utils/menus.cpp
 src/video/video_widget.cpp
@@ -44,3 +45,4 @@
 ui/mediasettingsview.ui
 ui/ringgearsmenu.ui
 ui/ringmainwindow.ui
+ui/usernameregistrationbox.ui