Problem with german language pack under Android (Subtitle delay)

I think I just found a bug in the german language pack under Android. When I try to delay the subtitle in the audio window the label only shows the text “VERZ” instead of “Verzögert um x ms”. When accelerating the subtitle delay the label is correct.

I’ve uploaded two screenshots to my Dropbox:
Accelerate: [Image: Ssa9C-tIA4FHRlSmhuzMRMY8SDh4Aro9Ln6IUVup...ize_mode=3]
Delay: [Image: 7CsNpJrqgFZlrTBmp3wgFSZ9J8t1BSjRJfQSsiUn...ize_mode=3]

This problem only occurs under Android. (In Kodi v16 and v17) Under Mac and Linux the label is displayed correctly. I think this could be a problem because of the german umlaut in the text.

Is this a know problem or should I report this as a bug?