Improve message when the file filtering in the source browser fails if the repository's file tree is too large to fetch

The behavior here is the same as BCLOUD-20133 which was closed as "won't fix" due to low priority.

The error message then was updated from:

To

The term "large files" might give the impression of the reference to the size. We would like to ask for a clearer message, which could have a reference not only to size but also to the repositories which contain a high number of files regardless of the repo size.

Eg.:
This repository contains a large number of files to display. The filtered list is only displaying contents from the current directory."

Also, the "current directory" is not clear if it includes the child/subdirectories or the ultimate directory. A clearer message on this part would be helpful as well.