Condense Matrix and Browse mode into one

In Matrix https://hosted.weblate.org/matrix/weblate/application/?lang=da&lang=nb_NO&lang=de allows setting up alternative languages, but having them by default would be nice. Also there is no flipping through pages in this mode.

I think condensing browse and matrix mode into one makes sense.

https://hosted.weblate.org/browse/weblate/application/cs/ already has search and pagination.