'URL encoding of DeepL in OpenSearchDescription - pluses instead of spaces

This search engine DeepL:
https://mycroftproject.com/install.html?id=93166&basename=deepl\_autoen&icontype=ico&name=DeepL+ANY+-%3E+EN

typed "nalej zupy" returns "nalej+zupy".
It should be with a space, not a plus.

How to fix this, in this search engine?
https://mycroftproject.com/installos.php/93166/deepl\_autoen.xml

<OpenSearchDescription>
<!-- Created on Sat, 27 Oct 2018 23:43:19 GMT -->
<ShortName>DeepL ANY -> EN</ShortName>
<Description>DeepL translation to EN</Description>
<Url type="text/html" method="get" template="https://www.deepl.com/translator#../en/{searchTerms}"/>
<Image width="16" height="16">
https://mycroftproject.com/updateos.php/id0/deepl_autoen.ico
</Image>
<Developer>Anon</Developer>
<InputEncoding>UTF-8</InputEncoding>
<moz:SearchForm>https://www.deepl.com/translator</moz:SearchForm>
<Url type="application/opensearchdescription+xml" rel="self" template="https://mycroftproject.com/updateos.php/id0/deepl_autoen.xml"/>
</OpenSearchDescription>


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