Translate `library/xml.po`

[sofide]

This file is 86% translated and needs to reach 100%.

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

Current stats for library/xml.po:

• Total entries: 53

• Entries that need work: 7 - (14%)

  • Fuzzy: 5
  • Untranslated: 2

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