The ongoing work.
THE PROBLEM
Content changes. Translations fall behind.
An out-of-date translation is worse than none, because customers act on wrong information.
WHAT TO PUT IN PLACE
A process: every content change triggers a translation task
A record of which versions are current Someone responsible
WHAT HAPPENS WITHOUT IT
Secondary languages drift. Prices, hours and policies become wrong.
WHAT TO PRIORITISE
Anything a customer acts on: prices, delivery, contact details, policies.
Blog content can lag without harm.
WHAT TOOLS HELP
Multilingual plugins usually flag translations as needing update when the original changes.
Use that.
HOW TO AUDIT
Periodically, review each language version against the original.
Check anything factual.
WHEN TO RETIRE A LANGUAGE
If a version cannot be maintained, consider removing it.
Redirect to the main version.
Honest, and better than a misleading one.