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Whenever an external storage mount point is shared directly, its path is
empty which causes a leading slash to appear in the source path.

This fix removes the bogus leading slash in such situation.

This text is visible to admin users when they read the description of
the External Storage app.

"root" or "subfolder" -> "Remote subfolder" on selected storages

missed ftp...

* add disableEscape parameter to disable this functionality
* drop usage of escapeHTML() that is now done inside t()
* add unit test for escaped and not escaped placeholder
* proper JSDoc

* ownCloud 7.0.0 is needed - version of merge of server <-> server
  sharing - https://github.com/owncloud/core/pull/8399
* adjust error message

storage -> storages