Calling set_text on a label should update its value in the translation catalog
_Originally created by @alant on [#11957 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/11957)_ When the interface is translated, all the labels are reset to thier default values. The modifications made by set\_text should be stored\! Parent Task: tails/tails#10828
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