Research about Ğ1 monetary license integration and refactor of its handling in Silkaj
## Issues
- With `pipenv`, if running silkaj from and other folder than the project root, the relative path does not work.
- For Debian packaging, a [patch was needed to include those files](https://salsa.debian.org/cryptocoin-team/silkaj/commit/e43b8462691b0a2fdf121a0497497b417d6ddfb1).
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## Integration in external package
### Packaging from the repository
> Self-packaging refused by the community
- documents/g1_monetary_license#1
- documents/g1_monetary_license!13
### DuniterPy integration
- clients/python/duniterpy#159
### Packaging repository
- tools/g1-monetary-license-packager#3
### Debian package
- Create a Debian package
## Silkaj integration
- [x] Pull in the `git subtree` to update to the latest changes
- [x] Rename `license-G1` subtree folder to `g1_monetary_license`
- [x] #392: Include `g1_monetary_license` folder to the package: `pyproject.toml`
- [x] Implement code in Silkaj
- [x] Add helper to get the path of the licenses
- [x] Add Spanish, Esperanto, and Portuguese languages choices
- [x] Write documentation in `CONTRIBUTING.md` on how to manage the `subtree`:
- [x] Warn to not modify the monetary license here but on its repository
- [x] Procedure on how to pull changes from `g1_monetary_license` repository (`remote`, `subtree`)
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