What to check.
FOR EACH LANGUAGE
Every page type loads Navigation and menus are translated Forms are translated, including error messages Emails send in the right language The switcher works from every page Dates and numbers format correctly
FOR SHOPS, ADDITIONALLY
A complete purchase Every order email Checkout text Payment methods available
WHAT TO TRIGGER DELIBERATELY
Form validation errors, to see their language A not-found page An empty search result
Those are frequently untranslated.
WHAT TO CHECK IN SEARCH
That each version is indexed That the language signals are correct That Search Console reports no problems
WHAT TO TEST ON MOBILE
Everything, again.
Longer translated text frequently breaks layouts designed for shorter text.
THAT IS A REAL PROBLEM
German and French text is typically longer than English.
Buttons and navigation overflow.
HOW OFTEN
After every significant change.
