Auto accesskey a

as you put forward in !97 (closed), here is a jq script to add firefox accessKey. It doesn't deal with missing item, but messages files should have that all the time AIUI.

CI pipeline with debian:latest should have jq 1.6, which works okay on my F36 too.

I have added EOF newline to all files, to ease the diffing review if people run the loop locally.

If you find this helpful, please label hacktoberfest-accepted too. Thanks in advance!