[OIL-230] Throw error when locale object misses properties

[coveralls]

Pull Request Test Coverage Report for Build 644

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 352 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.8%) to 22.614%

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Files with Coverage Reduction	New Missed Lines	%
dist/oil.bundle.js	352	22.61%
<!--	Total:	352		-->

Totals
Change from base Build 636:	-0.8%
Covered Lines:	935
Relevant Lines:	3316

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💛 - Coveralls