>but what is the LC_NUMERIC variable and what is C ?
>just to know if it breaks something else.
It is for locale things, in this case numbers. Setting it to C means that no
translation is done, it uses what the original code has.
LANG, LC_* were created for this, to decide how do you want to see numbers,
messages, dates and such, C is the untraslated version (normally English,
but could be anything).
So break anything? I doubt, but you will not get messages translated (no
problem if you know the languaje they appear on).