Remove unnecessary frozen hash duplication
Remove unnecessary frozen hash duplication

The initialize method creates a copy of the frozen hash containing
default approximations, then using the add method, it fills the
approximations hash (local variable) with its key-value paris.

To avoid creating this temporary object, a new method fills the
approximations hash directly.
godaddy/i18n,Bartuz/i18n,svenfuchs/i18n,daniel-rikowski/i18n