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* Add sublabels for "port x controls" entries Due to the port-specific indexes, sublabels for these entries are handled specially. Some simplification/generalization was applied and hand-crafted string joining was removed from a few places, though it remains still in other places. Preparation for #16121 (this commit does not do anything yet with file names). * Further simplifications around joypad_index Removed a few labels, now unused, and the left/right check, as it fell back to the default which is given anyway in advance.