Translations:Help:Extension:Translate/Page translation administration/75/en

Splitting units. You can split existing units by adding an empty line in the middle of a unit, or by placing $translate tags so that they split the unit. You can either keep the unit marker with the first unit or remove it altogether. In the first case, translators see the old text when updating the old translation. If you removed the unit marker, both units will behave as if no translation ever existed, after the page is re-marked for translation.