Fix table loading bug for CRH transliteration

Fix table loading bug for CRH transliteration

In production, the regex and exception tables were not being loaded,
resulting in very poor transliteration. The loading has been moved to
the contructor, similar to the implementation of the Kazakh
transliteration.

Also, a bug in the mappings for Ö/ö -> Ё/ё and Ü/ü -> Ю/ю has been
fixed.

Test cases for specific additional examples have been added. (Though
it is worth noting that the regex and exception tables did load
properly during unit testing, so the problem wasn't caught there.)

Bug: T186727
Change-Id: I6bacee7d9de6f4a870a8a9ef1f04b819ad489c02