When you join an online meeting by using Lync Web App, the text on the IM button, the Phone button, and the Share button are cut off. This issue occurs if the text is localized in the following languages:
To resolve this issue, install the following cumulative update:
2449497 Description of the update package for Lync Server 2010, Web Components Server: January 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.