Store aggregation pipeline export language
Each time you start a new aggregation, the export language is always "Python 3"., so if you're using different language, you have to set the wanted language each and every time you change the active collection or open a new tab...
The default selected language could be:
- the last used language (easier but still efficient)
- the last used language for this connection
- the last used language for this collection
- a language configured as "preferred language" when adding a connection as favorite
- a language configured as "preferred language" at the app level...