docs(lang): update Spanish translation for recording warning

[KevinCaballeroCuriel]

Added Spanish translation for the string "Other participants may be recording this call" in lang/main-es.json. Updated to: "Otros participantes pueden estar grabando esta llamada".

[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 :(.

[KevinCaballeroCuriel]

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 :(.

DONE