fix(upgrade): fixes erroneous values in the list of processed upgrades

Code in the upgrade includes was overwriting variables in the upgrade
service resulting in an object being saved to the list of processed
upgrade where the filename should have been. This upgrade replaces the
class with the filename and isolates the scope of the include so
upgrades cannot break the process.

Fixes #7198
Merge pull request #7199 from juho-jaakkola/issue-7198

Fixes erronous values in the list of processed upgrades
chore(i18n): update translations
chore(release): v1.9.1
Merge pull request #7201 from juho-jaakkola/release-1.9.1

Release 1.9.1