Investigate Adblock pattern duplication
_Originally created by @sajolida on [#6909 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/6909)_ Verify that all patterns from easylist (standard) are indeed in (at least one of) the two other ones (easylist+fr and easylist+de). Parent Task: tails/tails#6908
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