You join an online meeting by using Microsoft Lync Web App. You hover the mouse pointer over the meeting details link. In this situation, the text in the tool tip is not localized.
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.