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Tested under Hebrew + English (If hebrew works I think all UTF langs will be O.K.)
under 3 modules: NewBB 4.06 , Article 3.0 . Tag module (latest)
works fine with 2 . 3. 4. 5. words (probably endless) ...
But - again - it's not enough, tag module is a semantic bridge between modules - important as if it was a core module, needs to be taken care of .... not just a litlle bug fixes ....