tinyMCE strips the multi language tag if paragraph tags are used inside span tag.

[MuellerAle]

tinyMCE strips the multi language tag if paragraph tags are used inside span tag. This breaks multi language content in Moodle (questions or descriptions).

Reproduction steps:

1. insert the follwoing code in https://www.tiny.cloud/ as "source code" and click "save code":

<span lang="en" class="multilang">
    <p>English text 1</p>
</span>
<span lang="de" class="multilang">
    <p>German text 1</p>
</span>
<p>break</p>
<span lang="en" class="multilang">
    <p>English text 2</p>
</span>
<span lang="de" class="multilang">
    <p>German text 2</p>
</span>

2. open source code again.

✔️ Expected result
code stays as:

<span lang="en" class="multilang">
    <p>English text 1</p>
</span>
<span lang="de" class="multilang">
    <p>German text 1</p>
</span>
<p>break</p>
<span lang="en" class="multilang">
    <p>English text 2</p>
</span>
<span lang="de" class="multilang">
    <p>German text 2</p>
</span>

❌ Actual result
code is stripped as:

<p>English text 1</p>
<p>&nbsp;</p>
<p>German text 1</p>
<p>break</p>
<p>English text 2</p>
<p>&nbsp;</p>
<p>German text 2</p>