[d-i] Fix Amharic strings

[Davide Viti <zinosat@tiscali.it>]

Hi,
I've just fixed some country strings reposted as wrong by the spellchecker [1]
in the Amharic translation for level1.
Please review my patch (r50081).

regards,
Davide

[1] http://d-i.alioth.debian.org/spellcheck/level1/index.html

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