Translate only new lines in the file

[Mishurt18]

I'm developing the game and posting regular updates to it.
In each new version of the game I add new phrases, dialogs.
I used to manually generate translations and select the option “Generate empty strings for translations”. And I used to insert the translation into those empty strings.
I wish there was a choice to have your program translate only those phrases for which there is no translation. Only lines labeled with a new “”.

[Mishurt18]

Or empty strings from any characters must be translated.