Make Adblock Plus filter lists lighter

Originally created by @sajolida on #6908 (Redmine)

Our filter lists for Adblock are redundant. EasyList exists 3 times: 1st list is EasyList, 2nd list is ListFR+EASYLIST, 3rd list is EasyList Germany+EASYLIST.

* both easylist+fr and easylist+de are larger than the regular
easylist
* I’ve grepped a few patterns from easylist and found them in the two
other lists

So it looks like we’re shipping the same patterns three times.

Subtasks

#6909 (closed)
#6910 (closed)

Edited May 15, 2020 by sajolida

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