#6 admin interface repartition between navigation and sentence panel

[trt t]

(tested on nexus 7 2013)
When you change the size of an indiagram (from 160x160 to 200x200), or the size of the font
If this change need a resize of the sentence panel, in the admin interface :
the parameter navigation area size change to 28 %
(doesn't change the main interface juste the parameter in admin interface
=> may lead to an undesire change if a user just click on "ok" button)