Explain better how the verification works
_Originally created by @sajolida on [#14997 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/14997)_ https://gitlab.tails.boum.org/tails/tails/-/issues/14945#note_34484: « When I see “Verification failed” I immediately had the feeling that I want to know why. Could we add something like “Checksums did not match”? Or something similar? » Feature Branch: web/14997-explain-better-verification-and-failure Parent Task: tails/tails#12328 ### Related issues - **Related to** tails/tails#14998
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