What goes wrong.
THE SWITCHER GOES TO THE HOMEPAGE
It should go to the equivalent page.
Configuration, usually.
UNTRANSLATED INTERFACE TEXT
Buttons, forms, emails.
Use the site in each language and look for it.
WRONG LANGUAGE SERVED
Almost always caching not configured for languages.
LAYOUT BROKEN IN ONE LANGUAGE
Longer text overflowing.
Design for the longest, not the shortest.
SEARCH ENGINES SHOWING THE WRONG VERSION
The language signals are wrong or incomplete.
DUPLICATE CONTENT WARNINGS
Versions not properly declared as alternatives.
TRANSLATIONS OUT OF DATE
No process. Put one in place.
EMAILS IN THE WRONG LANGUAGE
The notification system does not know the customer's language.
Check your plugin supports it.
WHAT TO CHECK FIRST FOR MOST OF THESE
Caching configuration, and the language signals.
