Try to hack collapsing columns, make modal menu scrollable on mobile phones, add remember me button to nextcloud

It only detects i18n.t by default

Upload was broken without any error with webdav-client 4.x. This was
hiding the error.

This option doesn't exist in webdav.client 3.x but is required in 4.x
due to https://github.com/perry-mitchell/webdav-client/issues/266

This will switching between versions easier.