* the front-end now use global constants, based on the translation key
* build-client.js use the ESBuild "define" directive to replace these
globals at compile time, by the english value
* build:client must now be called after build:languages
* moving the loadLoc and loc backend functions in a separate lib
Contribution now have to be made on the main branch.
A new `documentation` branch is created. Github and Gitlab pipelines are
now working on this branch.
Develop branch is deprecated, as it is no more necessary.
