Translate error text if layer has no reports.

[caseycesari]

• Wrap text in translation function.
• Drop period from error message so that it matches the key in the translation file, which doesn't have a period.

Testing

• Switch the framework language to es.
• Add some layers that don't have reports.
• Draw a report area.
• The error message for each layer should be translated.

Connects to #22

[mmcfarland]

+1, tested.