'Language-Accept' header set in the JSD/JSM actionExecutor.py script causes errors with certain Jira language extensions and plugins

Issue Summary

We are setting a 'Accept-Language' header in our actionExecutor.py script for JSD/JSM - this is set with a value of "application/json", which is causing issues with certain language/translation extensions in Jira as "application/json" is not a valid language value. This is done in two places - here:

https://github.com/opsgenie/oec-scripts/blob/master/JiraServiceDesk/scripts/actionExecutor.py#L102

and here

https://github.com/opsgenie/oec-scripts/blob/master/JiraServiceDesk/scripts/actionExecutor.py#L102

I suspect this was intended to be simply an 'Accept' header - which would make sense with the value being set. 

Steps to Reproduce

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Expected Results

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Actual Results

N/A

Workaround

Customers can modify the script once the package is installed - either removing the 'Accept-Language' header entirely in both places, or changing it to 'Accept'.