[TECHNICAL REQUEST] LPS-50578 Changing language is impossible on pages like terms_of_use

Hi Brian,

This is a continuation of https://github.com/brianchandotcom/liferay-portal/pull/21642

You asked me to rename the properties to portlet.*, I did it and tested again.

The testing is a bit hard, because on trunk somehow some code disappeared from terms_of_use (and similar) pages:
```
<form action="#" id="hrefFm" method="post" name="hrefFm">
	<span></span>
</form>
```
But I wrote it on the LPS:
https://issues.liferay.com/browse/LPS-50578


Thank you in advance

Péter Borkuti
cc: @zsigmondrab, @topolik