This thread is resolved. Here is a description of the problem and solution.
Problem: Client could not translate some fields in the composite products of his e-commerce site. The product fields for "bto_group_data" were locked and the client could not translate the product name and descriptions of single components. He also needed to translate the custom prices and some TM global options where the translated product was to show different data than the original product.
Solution: The missing field was added to String Translation using the Multilingual Tools plugin to register the field in a language configuration file.
Client was following an errata recommendation for older WCML version that recommended to use the manual translation. But in this case using the Translation Editor worked fine as the WCML version had been updated already.
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