Evolve strings for Polylang present but not used

Hi,

I don’t manage to get the parralax slider (or the homepage content boxes) strings to be translated
* They’re filled in the theme options : http://screencast.com/t/Vc3a0qsDf0Oe
* The theme folder contains wpml-config.xml (added/completed with the last theme update i believe)
* I added lines such as <key name="evl_slide1_title" /> in it’s <key name="evl_options"> collection
Full file content : https://mensuel.framapad.org/p/afiwpmlconfig
* I see the corresponding field’s value in polylang string list, and filled the translation : http://screencast.com/t/xqqakxIQVoID

But none is used, the homepage always displays the initial value i put in the theme options, whatever language is selected.

Did i miss something ?

I’m using WP v4.6 and :
Evolve Version 3.6.4
Polylang Version 2.0.4

Thanks in advance