divelist.c: gasmix-default translation

[Lubomir I. Ivanov]

divelist.c:nitrox_data_func():
if the gas mix values for a dive are zero for O2 and He we show "air",
which isn't translated and perhaps it should.

i'm not an expert, but should "air" be used to describe a more neutral
state when the only two gases we are interested in a proportion are
both missing?

http://en.wikipedia.org/wiki/Diving_cylinder
"These cylinders typically contain (atmospheric) breathing air, or an
oxygen-enriched air mix:"

i can also see 72% N used here for "nitrox":
http://en.wikipedia.org/wiki/Nitrox

but we are only mixing O2 and He in nitrox_data_func()...hm.

forgive my ignorant intrusion...
lubomir
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