International Mother Language Day (IMLD)?

Today is International Mother Language Day (IMLD) and I wonder why it reads ‘mother language’ rather than ‘native language’ or ‘mother tongue’. So, my question is if the following are acceptable collocations:

  • native language
  • mother tongue
  • mother language
  • native tongue
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Since each refers to and signifies one’s own language, I think the collocations (though they are new combinations) would be acceptable.

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