Improve app identifier string in "devices and sessions" list

Expected behaviour

The app should identify itself towards the nextcloud server with a device string that contains usable information. This is solved very well by the talk app, which identifies itself with the string "$DEVICE_NAME (Nextcloud Talk)", see screenshot below. The string of the files app is lacking information. I suggest to change the string to "$DEVICE_NAME (Nextcloud Files)" to set it in line with talk. Also, this helps to seperate the devices if more than one is used.

Note: If this enhancement request is accepted it should be spread to other apps such as android and desktop client.

Actual behaviour

The app identifies itself with "Nextcloud iOS app Nextcloud" which is lacking any information and holds the word "Nextcloud" two times for no reason
see:

Steps to reproduce

Install app
Connect to your nextcloud
Check the entries in the "devices and sessions" list

Reasoning or why should it be changed/implemented?

iOS version

13.5

App version

2,25,9,2

Server configuration

Nextcloud version: 19.0.0

Search the iOS codebase for the current identifier string "Nextcloud iOS app Nextcloud" and trace where the devices-and-sessions app name is assembled. Update it to include the device name and "(Nextcloud Files)", then connect the app to a Nextcloud server and verify the resulting entry in the devices and sessions list.