[i18n] Fix typo in Spanish translation: “úmero” → “número”

[edgardorios]

This pull request corrects a minor typo in the Spanish and Spanish (LATAM) translation files:

• locale/es/LC_MESSAGES/inventory_and_mrp.po
• locale/es_419/LC_MESSAGES/inventory_and_mrp.po

The word “número” was missing the initial "n" (“úmero”), and this change adds it back.

Thanks!

[robodoo]