Translate `library/mimetypes.po`

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This file is 85% translated and needs to reach 100%.

The rendered version of this file will be available at https://docs.python.org/es/3.13/library/mimetypes.html once translated. Meanwhile, the English version is shown.

Current stats for library/mimetypes.po:

• Total entries: 54

• Entries that need work: 8 - (15%)

  • Fuzzy: 6
  • Untranslated: 2

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