OIL-170: remove unnecessary error message about locale definition

[coveralls]

Pull Request Test Coverage Report for Build 144

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 210 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 24.14%

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Files with Coverage Reduction	New Missed Lines	%
dist/oil.bundle.js	210	24.14%
<!--	Total:	210		-->

Totals
Change from base Build 136:	-0.01%
Covered Lines:	858
Relevant Lines:	2877

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💛 - Coveralls