[BUGFIX] Extension details are difficult to read

The problem: The label column is just 100 px wide,
causing linebreaks in the label.
This can result in incorrect reading, e.g. :

Loaded  		yes
in Frontend:

The correct reading is: Loaded in frontend: yes.

Setting .em-extlist-extinfo label, .em-info label { width:200px;}
makes it easier readable again.
Resolves: #30596
Releases: 4.6

Change-Id: I2317dde021b363783562b1e749028c68db369c42
Reviewed-on: http://review.typo3.org/6034
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Stefan Galinski
Tested-by: Stefan Galinski