Two new panels / uitklapvensters

[uklomp]

We want to have two new fields / uitklapvensters when we open a sign's entry / when we see the gloss details. One above morphology, titled "Video's met non-manuele elementen" (see issue #1169) and one between "notes" and "other media", titled "Voorbeeldzinnen" (see issue #1178)

The order of all the fields will then be (in Dutch): Video's met non-manuele elementen Morfologie Fonologie .... Aantekeningen Voorbeeldzinnen Andere media