Hi Andy,
Thanks for the message. I've opened up a topic here: https://community.openstreetmap.org/t/policy-on-accented-road-placenames-specifically-welsh/72145/3
But I can't understand how to get a reponse, and Frederik mentions that 'I have ignored messages', so it seems I am missing a platform or there are some other crossed wires. Any ideas?
Meanwhile, I'll have a look at this edit here, where perhaps my JOSM crashed halfway through an edit(?). 17514 is for adding placenames to buildings from local knowledge and Historic maps. I have spoken with CJ about this project, which is extremely important/valuable to our local community. You can see some notes on the osm.wiki. organised editing:
https://wiki.openstreetmap.org/wiki/Organised_Editing/Activities/Mapio_Lleisiau%27r_Tir/Mapping_Land_Voices_Cymru/Wales
Best,

Rupert