Glossary terms with Umlauts do not work

Another problem – hope you have a fix for that as well?

When using German Umlauts in a Glossary term, the page is displayed wrong – characters a missing so I guess it has something to do with the length calculation.

Example text:

When we wish you good luck in Germany we wish you Glück.

We do so on birthdays, weddings or before an exam.

Having a glossary term for “Glück” and for “birthdays” the result is

<p>When we wish you good luck in Germany we wish you <span class="glossary-tooltip"><span class="glossary-link"><a href="https://internetagentur20.de/glossary/glueck">Glück</a></span><span class="glossary-tooltip-content clearfix"><span class="glossary-tooltip-text">The German word for luck or happiness....</span></span></span>do so on birthdays, weddings o<span class="glossary-tooltip"><span class="glossary-link"><a href="https://internetagentur20.de/glossary/birthday">birthdays</a></span><span class="glossary-tooltip-content clearfix"><span class="glossary-tooltip-text">Time to celebrate....</span></span></span>an exam. </p>

After the first term some characters are missing, the second term (birthday) is (as a consequence?) on the wrong position.

I guess this will apply as well to other special character as e.g. accents.

Can you help?
TIA