Update main-el.json

[rinenweb]

Corrected some typos and made a few linguistic improvements.

[pullrequest]

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[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[rinenweb]

Hi, thanks for your contribution! If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

I signed it 2 years ago, it's not my first contribution. Unless the CLA has changed and it needs to be signed again. Please let me know. :)