Tails Installer does not allow upgrade in languages that have a translation for the "Clone the current Tails" string

reported by user (thanks!) confirmed by me.

Steps to reproduce:

• Start Tails 4.12 in French
• Open Tails Installer
• Plug USB stick with Tails

Error:

The Upgrade button is grey, cannot be selected. Plugged USB stick appears on the dropdown menu.

What should happen:

The upgrade button can be clicked.

Incidentally, I have tested on Tails 4.11~rc1 and the button works well, and also the Installer is translated, while it is not translated in Tails 4.12.

Affected languages: da, fr, tr