[BUG] Words directly followed by opening HTML tags get trashed during translation

[henner79]

Describe the bug
Whenever a content element is translated via wv_deepltranslate / DeepL, words that have an opening HTML tag directrly behind them (no whitespace) get trashed in a specific way. In our case, product names are followed by a superscript registered trademark sign. In the translation, the whole product name is superscript as well!

To Reproduce

Create a content element (e.g. CType 'text') and add this to the field 'header' or 'bodytext' (code view):
Try the new FOOBAR<sup>®</sup> now!

Translate it to a language of your choice. The result looks like this:
Probieren Sie das neue <sup>FOOBAR®</sup> jetzt!
(the whole product name is superscript now - this means lots of "postprocessing" for us)

Expected behavior
We expected the translation to look like this:
Probieren Sie das neue FOOBAR<sup>®</sup> jetzt!

Side info: Product names within text are generally not translated in our case.

TYPO3 Setup

• TYPO3 Version 11.5.23
• PHP version 7.4
• Extension version 3.0.5
• DeepL PAID API
• composer setup

Additional context
We did some debugging an figured out that the result returned from the DeepL API already contains the error. We contacted the DeepL support (we are a paying client). They took 3 months (!) for a reply, stating that they could not do much about it. However, they had some suggestions like putting a whitespace between the product name and the registered trademark (which is no option for us, and no "solution" anyway). And they suggested the use of placeholder tags like <placeholder suptext="®" /> during translation.

Suggestion
Maybe, some workaround for such cases could be added to wv_deepltranslate - e.g. by using the "placeholder" tags suggested by the DeepL support (see last paragraph). They could be added dynamically before the translation, then removed thereafter?