Add icons to the management section

[nickvergessen]

A new layout was introduced with #35

But this hides some info, which helps to quickly find the entry you were looking for. It would be cool, if we could have icons for the devices:

• Android App
• iOS App
• Desktop client
• Browser
• All devices

@jancborchardt could you help with those please? :)

Maybe we could also add icons for the languages in the server one day, so there is a flag for each language which can be used in the overview to identify the entries quickly.

[MorrisJobke]

Moved to 15.

[jancborchardt]

We could use the icons we also use for the connected sessions? https://github.com/nextcloud/server/pull/7754

[nickvergessen]

Yeah those were just nit there back then

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