Hello Ken,
I will always write contributions to the forum as well as questions to members, who's langauge I don't know, in English.
However, I will not write any photo-comments in English, which are aimed to some German fellow-shipspotters. It would be nonsense, to write in English to people I know, and we speak better German than English !!
However, I think it is not unfair, because if any other member who does not understand the German comments, does REALLY show interest in knowing what is said, then a friendly question would help, and I would translate, even sometimes we are writing comments that are not having so much informative meaning but more some little fun.
I do not have a problem, when some members from Klaipeda area are writing comments on my photos in their language as happened, because if I really want to now, then I ask. If I do not see any need to know, then I leave it as it is.
I also do not mind any of the other members writing photo comments in their language, because why should this disturb ? As well I do not have to understand all, if some Dutch folks are having fun with photo comments, why not let them, and if really courious.. then ask !
I think, in forums and in general, use of English should be compulsory, but otherwise, I think with photo comments a bit of tolerance should be shown.
Just my opinion