Update copyright header in recently merged ab_GE locale

ab_GE locale was committed under DCO and this header
proposed in [1] suits it better.

[1] https://sourceware.org/pipermail/libc-alpha/2021-September/130692.html



Signed-off-by: Maxim Kuvyrkov <maxim.kuvyrkov@linaro.org>
Signed-off-by: Nart Tlisha <daniel.abzakh@gmail.com>