Missing translations for categories in the "Shortcuts" menu

[P3run]

In the "Shortcuts" menu categories have English names (Social Media, Maps, Transport, Weather). It would be great to make them configurable via translation files.

[haruspeks]

Shortcuts are meant to be fully customizable by the user, categories included. It's free text and the modal window groups all the links based on categories by the same name.

{
    name: "Twitter Media",
    category: "📱 Social Media",
    url: "https://twitter.com/search?q=geocode:$lat,$lng,1km&f=media",
},

In order to provide translation for the categories, they'd need to be locked on a specific preset.

I'm not against the idea per se, but this tool was designed to be as accessible as possible for non-techies as well (think of researchers, journalists, investigators), and having a fixed preset of categories might make things a bit confusing while customizing the configuration via file. One way to make this happen without much fuss could be #2, which makes Avoc configurable from the UI.

I'll leave this PR open in the meantime, with a tentative to do list:

1. wait for Add a configuration window on the UI #2 to be implemented
2. identify a preset of categories
3. implement the choosing of a category via dropdown on the UI