The latest changes to wxTranslations::AddCatalog() behaviour were not
backwards-compatible and also had other problem, so revert them for now,
even if this means that #18227 has to be reopened.
This is a combination of the following commits:
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Revert "Fix regression in wxTranslations::AddCatalog()"
This reverts commit 14e905858d.
See #18297.
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Revert "Fix crash in translations code when no translations are found"
This reverts commit 80904d1bc7.
See #18299.
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Revert "Rename new wxTranslations method to GetAcceptableTranslations()"
This reverts commit 20b02d6169.
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Revert "Load catalogs for all preferred languages, if they exist"
This reverts commit 2d784da2ee.
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Revert "Allow getting all usable translations languages"
This reverts commit 5d08e404c7.
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See #18227, #18300.
Closes#18302.
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