Cleanup i18n dynamic path for locale file paths

[nicolas-brousse]

Use a more precise path fot i18n load_path to avoid loading other yaml
file on components.

On a project I created an image component to easily generate an html picture tag. And so I also create a formats.yml to store my images formats I want to use.
And so with the current path used for i18n.load_path, my formats.yml file is loaded with locale files.

I do this update on my app and it seems good enough.

[coveralls]

Pull Request Test Coverage Report for Build 502

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 482:	0.0%
Covered Lines:	118
Relevant Lines:	118

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💛 - Coveralls