sorry for writing in English but I cannot speak Polish.
In German forum, user Ulamm claims that all towns and stations in Poland and Czech Republic should not have name:de tags because they are not in Germany any more (most of the towns has belonged to Germany until 1945). He hasdeletedname:de tags from a couple of towns in Poland and Czech Republic over the last days. He also deleted both name:de and name:en tags from railway stations. (I don’t know why he left name:ru)
I think that edits of this type are ruled by Mechanical Edit Policy. This policy requires a discussion BEFORE editing. He did not do that (I have looked for a discussion in international, German, Polish or Czech forum/mailing lists and found nothing)
I ask you as the OSM community in Poland: What is your opinion? Are his edits good or not?
Not so far ago we have a similar ideas from user alfat here: http://forum.openstreetmap.org/viewtopic.php?id=25130
The conclusion from that short discussion were that name:de and old_name:de “belongs” to german users - in polish speaking maps we prefer to use name:pl (or old_name:pl for historical maps) and use name only, if name:pl does not exists (also for maps containing area of Germany ). Of course for polish towns name should be actual polish name, but we do not claim anything about name:de (at least we do not claim to remove them just because these are not german towns).
That is, what I’ve done: For Słubice I changed name:de=Dammvorstadt to old_name:de=Dammvorstadt, created name:de=Słubice (as in Frankfurt everybody talks of Słubice and the street to the bridge is officially named Słubicer Straße), and I created old_name:pl=Zulbice (taken from pl.wiki), as many German readers believe, in that region the Germen names were the original ones.
I wrote it in the German forum a few minutes ago, I repeat it here in English.
I will revert Ulamm’s name changes (apart from Słubice) today or tomorrow. He seems to be troll. He issued this topic almost two years ago. He has damaged a lot of other name:* tags with his edits (he removed at a couple of towns all name:* tags and only left name=*.
He posts nonsense about this topic. As a reason for his deletion, he says that search engines should translate the input from users’ languages’ to the local language … (I could continue but I do not want to write to much about him)
Only in three places, all outside Poland, I had deleted useful tags for other languages. In most of my edits I only changed name:de=… to old_name:de, especially, where the name:de=…s were used for street names, intending to create a bar between German visitors and the life of the inhabitants.