User:Monkbot/task 15: normalize lang icon templates

This task converts language icon templates and their various redirects to  as a response to the only consensus achieved at this TfD.

description
Task 15 maintains a mapping of the templates and their various redirects to ISO 639 languages codes or IETF language tags. When located in article text, the icon templates are replaced with a template with the appropriate code as the parameter value.

It is relatively common to find multiple icon templates listed together. When this occurs, task 15 will replace the multiple icon templates with a single template with multiple parameters:

and its redirects is the working template for templates. When or a redirect is found in article space, the template or redirect is replaced with.

Task 15 skips pages that include.

ancillary tasks
There are no ancillary tasks.

This task does not do awb general fixes.