Add UN Amharic transliteration 1967 system

[ronaldtse]

Originally from the Imperial Ethiopian Mapping and Geography Institute.

See http://www.eki.ee/wgrs/rom1_am.htm for spec.

Original spec: https://unstats.un.org/unsd/geoinfo/UNGEGN/docs/2nd-uncsgn-docs/E_Conf61_4_Add1_e.pdf

Original spec PDF: E_Conf61_4_Add1_e.pdf

[ronaldtse]

For @tsega

[ronaldtse]

@tsega can you confirm this is implemented in #414 ? Thanks!

[tsega]

@ronaldtse I can confirm that the #414 implements Table 2. Amharic-to-English transliteration system of the Imperial Ethiopian Mapping and Geography Institute shown above.

[ronaldtse]

Thank you @tsega! Closing this.