How can I report to Drupal what is the translation in a language of a string passed to t()? I'm using Drupal 7. I see that the t() function is responsible for translating terms. Where do I go to find the list of translatable terms? For example, suppose I have t('hello world') in my code.  What file do I edit to tell Drupal 7 that the French version of "hello world" is bonjour toute le monde?
You could browse to the Translate interface page
(/admin/config/regional/translate/translate).
You could use a .po file and import it (en/admin/config/regional/translate/import).


You'll have to enable the Locale module for this (it's in core).
More information is available on Translating a site interface to different languages.