Then the review tool is the wrong place to report this issue.
Please open an issue on github.

Any kind of history saving is the task of either Firefox itself (you can configure Firefox to save your session) or of other "Session saving" addons.
List of all closed tabs is possible. Have a look at the addon configuration.
Closed windows is a feature request which is listed on github already. So far impossible as the relevant API was broken when I last had a look at it. Maybe I should have another try.

To adapt for your localization, the proper way would be to do a full addon translation.
https://lusito.github.io/web-ext-translator/?gh=https://github.com/M-Reimer/undoclosetab/
Would be great if you could do a translation and then use the "Submit changes to the developers" button in this online translation tool (github account required).