When you modify the PageTitle property of a new Page Definition to a label with a ‘special’ character in it. You will see that the title is not rendered well. For example when you use a é it will be rendered as &#233. I logged this case with Microsoft and for the moment there is no fix for this issue, but they suggested a simple workaround.

Workaround:
When you edit your page in Sharepoint, you can remove the ‘Dynamics Page Title Web Part’ and replace it by the old ‘Page Title Web Part’

Explanation:
The reason why there are two Web Parts is mainly the “Page Title Web Part” is the old Web Framework (Dynamics AX 4.0) – and rendering takes part in X++ code while “Dynamics Page Title Web Part” is implemented completely in C#.

(Source: Microsoft)