Ok, but this will be script heavy.You'll have this for each and every label you have in your form and the choice will be on the user side.But, in fairness, if there is no way to á priori know the language in wich to display the form, it is probably the best way.

Yes it is, but you should contact an System Integrator of your area http://www.adobe.com/enterprise/partners/si_index.html

If you could make your decision based on the user that invoked the service, would that solve you problem?If not, then i don't know how to solve your problem, if so then check out the attached teste service.

You can navigate/view an XDP file as if here a XML file, because its basicly a markup language with the same basic rules, but different taglibs.You should be able to work with it using any XML application / API just like any other XML file.The xdp:xdp tag you're talking about is nothing more than a namespace (http://www.w3schools.com/XML/xml_namespaces.asp).

Task Manager endpoints is something i haven't got around to fiddle with.I left my VMs at Home so i don't have a LC:ES 8.2 version here, i'll try to see thoose issues on Monday, but, if they're anyway like Watched Folders you can always pass a variable to indicate the language you wish to get.Just one question, do you have a set of rules that tells you what language to use?