Create a dedicated jenkins job for submitting updated translations on supported branches

Our current release process involves to update the translations before releasing a bug fix version. In case of LTS this is can be quickly error-prone since we need to carefully review the changes just before the release and without CI seatbelt. It's common that we just skip it to be safe, meaning that later another release manager will have to review more changes.

It would be far more better to regularly get the updated translations directly on the LTS branch before the release. Since we already have a script to update and push translations, I propose to create a new dedicated job on jenkins whose purpose will be to execute that script and create a pull request on the LTS branch with the updated translations.

Then we could execute that job regularly to get the updates before the release.