ENH: Add support for reports in Spanish

[fletchapin]

Use Case

Since the Design Specifications can be written in Spanish or English and the validation report will be available through the same website form, it would be great to extend the validation tool with Spanish report writing capabilities.

Solution

Add a language attribute of the report_writer class which defaults to English but can also be Spanish. Maybe make it an enum so we can detect invalid languages?

Then, whenever a line is written to the report have the ability to translate it. It would be great if these translations could happen similar to how the message strings work for Sphinx so that we could easily maintain them.

Alternatives

Hard code the translations since the number of different messages isn't that large at the moment.

[oliver-leung]

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