Wir können mit IE 11 keine Sonderzeichen in Confluence 5.5.3 einfügen. In der Box für das Einfügen werden keinerlei Sonderzeichen angezeigt.
Mit Firefox funktioniert es einwandfrei.
I've translated your question to english:
We can insert with IE11 no special characters in Confluence 5.5.3. In the box for inserting any special characters are displayed.
With Firefox it works flawlessly.
I believe you are facing this bug which was fixed on Confluence 5.8:
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