Untranslatable text "On " translate project

Hi,
I try to translate some text with:
https://premium.wpmudev.org/translate/projects/eab/fr/default

I've translated all lines starting With 'On '
Shortcut to translation page

I've downloaded the .mo file,
I've copy it to my website
term 'On ' is never translated on the front-end :slight_frown:.

Dimitri