Add Pay-by-Check email templates to Templates Area

[MaximilianoRicoTabo]

• Just add, add the templates to the templates area

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catch templates filter and add Add On templates to the template array.

Resolves #62 .

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[andrewlimaza]

We should move the body content to be PHP like we do in core (so it's translated by default)

[dparker1005]

We should move the body content to be PHP like we do in core (so it's translated by default)

Agreed. I have created #111 to track this enhancement so that we can implement this change in a future update.