Bug in LingvaTranslate Linguist translator that makes the translation "undefined"

There is a bug in LingvaTranslator

If the original text contains slash, "/", the translation is always "undefined".

Could this be fixed?

Another bug found, when "%" is in the text:

Unexpected token '<', "
<h"... is not valid JSON

[Unicorn-42]

+1!

Would be also great to have LingvaTranslate supported officially, out of the box

PS:
A few days ago, Linguist + LingvaTranslate translator stopped working completely,
everything, all text, is translated as "undefined".
:-(