This is kind of odd solution as it will confuse people.
"The t() function, to save on performance for single-language sites, won't store the string in the database until it is requested from another language. View the page in one of the non-default languages in order to populate the database (t() calls locale() to do this), thus making the string available for translation."
what it means is that you wont find some string if it was never requested
1. When you create new string you need to visit it on other language page
2. When you change one that exist, old one is lost and you again need to visit page where it is to have it in Translate Interface