NSBundle: fix es.lproj path not generated #493
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The conversion between BCP 47 language tags and
the old-style language names ('English', 'German', etc) is quite complex, mapping ISO 639-1 language tags to the old-style names, and the result back to ISO 639-1 (-ish).
The ISO 639-1 tag for spanish 'es' maps to 'Spanish', which in turn maps back to 'sp'. The original input is not added to the list of possible names for 'lproj' folders.
We fix this by operating on the official input, when splitting language, variant, and region. The "mapped" tag is always added just to keep 'sp.lproj' working.