We figured this one out: you need to change your Regional Configuration to English (UK / USA).
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So now we're seeing the resources and modifying them, but after recompiling, registering with gacutil and restarting IIS there are no changes whatsoever.
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We did set our browser language to the one we translated the resources, restarted it, changed the regional configuration back to the native one and so on, but still, no changes regarding this resources (we modified the obvious non repeated ones in order to see them change and not wonder if we modified the right one)
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What are we missing?
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Thanks!