(parole:29349): Gtk-WARNING **: 13:05:28.386: Failed to set text '<markup><big><span colour="#BBBBBB"><i>by</i></span> <span colour="#F4F4F4">Unknown Artist</span></big></markup>' from markup due to error parsing markup: Attribute 'colour' is not allowed on the <span> tag on line 1 char 45
Unfortunately this seems to be a bug that only occurs in the British and Australian locale. With en_US everything is fine, so it's wrong in the translations...
Ok, I went to transifex and fixed the Australian translation (which was the only one affected, after taking a second look). The first sync back has already gone to Git: https://git.xfce.org/apps/parole/commit/?id=7f4a24fba90ec86a4230acfade9fae41bdb62809 The second one should fix the remaining labels/errors. Thanks for reporting this!