[Database] Refactor the database seeder to better allow translating

[tudoramariei]

Is your feature request related to a problem? Please describe.
Currently, the seeder JSON files are one JSON file with a different language key for each property.

Describe the solution you'd like
One of the structures below seems like a good choice. The first one is similar to the one in the lang folder:

data/ong
├── ro
│   ├── pages.json
│   └── settings.json
├── en
│   ├── pages.json
│   └── settings.json
├── uk
│   ├── pages.json
│   └── settings.json
└── ru
    ├── pages.json
    └── settings.json

data/ong
├── pages
│   ├── ro.json
│   ├── en.json
│   ├── uk.json
│   └── ru.json
└── settings
    ├── ro.json
    ├── en.json
    ├── uk.json
    └── ru.json

Describe alternatives you've considered
Alternatively, if we can configure Weblate to accept this file format, I think we can skip this.