Use the entire hash when generating unique id

[atesgoral]

Description

Fixing two issues:

1. The generateID() function used by the Babel plugin is grabbing the first 5 characters of the stringified hash for no reason. The string-hash library returns 32-bit unsigned numbers and the maximum length a stringified hash can get is just 7 ((0xffffffff).toString(36).length) -- so there's really no point in trimming it to 5 characters. Trimming increases the chance of collision by 1296-fold (parseInt('100', 36)).
2. The test setup is wrong. Number.MAX_SAFE_INTEGER is 0x1fffffffffffff -- waaay over 0xffffffff :)

Type of change

• react-i18n Patch: Bug (non-breaking change which fixes an issue)
• Minor: New feature (non-breaking change which adds functionality)
• Major: Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have added a changelog entry, prefixed by the type of change noted above (Documentation fix and Test update does not need a changelog as we do not publish new version)