Populate routes to javascript on every full page load. Fixes #541

Before, we dynamically generated the javascript file via erb.
This causes problems with the asset pipeline, if an user changes the routes.
Remove routes file from assets set.

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Adds a sync task for updating the locale files with latest translation keys.

This helps to avoid falling back to default locale, if a translation key is missing. Closes #530
Remove translation keys that include interpolations.
Move the synchronization code from Rakefile into Alchemy::I18n module.
Use translated values for feature specs.