The full scope.
WHAT MUST BE TRANSLATED
Page and post content Menus and navigation Buttons and interface text Form labels and error messages Email notifications Product information, for shops Legal pages Error pages
WHAT PEOPLE FORGET
Everything except the main content.
A site with translated pages and English buttons, forms and emails is half-done and looks it.
WHAT ELSE DIFFERS
Date and number formats Currency Address formats Reading direction, for some languages
WHAT MUST BE MAINTAINED
Every version, on every change.
Publishing a new page means publishing it in every language.
WHAT BREAKS FIRST
The versions nobody speaks. They fall behind and become wrong.
WHAT TO DECIDE BEFORE STARTING
Who translates Who maintains What happens when content changes
Without answers to those three, the project fails.