Support 14.3/14.4 export path changes properly

[Morilli]

Had this diff applied for the longest time and I think it should be in main considering it's required to export 14.3 and 14.4 properly.

Basically, in 14.3/14.4 the output paths of localized files changed because the same file path had differing contents in all localized wads. This requires re-exporting the files because the code assumes that unchanged (same sha256) files can be symlinked to the previous patch, which fails when the export path of the previous patch is different.

Additionally, in 14.3 only the localized UI wad contains a common path and the other files don't. So for 14.3 specifically, we need to export the localized UI wad into language-specific subdirectories and for 14.4+ we can export all localized wads into those directories.