Pontoon: Update Welsh (cy) localization of Common Voice
Pontoon: Update Welsh (cy) localization of Common Voice

Localization authors:
- Rhoslyn Prys <rprys@posteo.net>

gozer/voice-web,gozer/voice-web,gozer/voice-web,common-voice/common-voice,gozer/voice-web,gozer/voice-web,common-voice/common-voice,common-voice/common-voice,common-voice/common-voice,gozer/voice-web,gozer/voice-web