Add note on professional localization

[dabrt]

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Add note on professional localization

Checklist

• [x] Text renders correctly
• [x] Text has been checked with vale

[github-actions[bot]]

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• docs/resources/contributing/contribute_translations.md

[mnocon]

My first thought was to wait with merge, but imho we could merge it right now? Even contibutions done right now might become lost.