Inconsistent use of monospace in displays

[XeR]

Table display uses <pre> which displays line breaks faithfully.
Every other display do not.

We should be consistent : either drop <pre> from table display, or use <pre> everywhere.
Using <pre> looks better, but we might encounter issues when tasks have multiple lines (see comments in #93)

[JJ-8]

As already said in #111, dropping <pre> solves the issue of newlines and word wrapping. Therefore I think it is better to drop <pre> instead of adding <pre> everywhere. It is also not worth the trouble in my opinion.

[JJ-8]

Closing since of #148