chrome://settings/searchEngines
Search engine
Keyword
URL with %s in the place of query
Google FR
fr
{google:baseURL}search?q=%s&lr=lang_fr
Google EN
en
{google:baseURL}search?q=%s&lr=lang_en
Google Translate EN2FR
2fr
https://translate.google.com/#en/fr/%s
Google Translate FR2EN
2en
https://translate.google.com/#fr/en/%s