Revert #11993: new number format system does not and cannot work for CJK languages

There are too many intricacies that I am unaware of that are popping up after
asking whether things are right or not.
I do not want to keep playing whack-a-mole, so just revert the whole thing.

This reverts:
15be383b93
360fe8b0b6
1aa9a5c0ab
59f56941e5
7e2eefb91f
b741b2ba6f
609d0071d5
9f8fd80112
a253205b93
819c6c756e

src/lang/faroese.txt

@@ -3,8 +3,8 @@
 ##isocode fo_FO
 ##plural 0
 ##textdir ltr
-##numberformat 00.000.000.000.000.000.000
-##numberabbreviations 3=00.000.000.000.000.000{NBSP}k|6=00.000.000.000.000{NBSP}m|9=00.000.000.000{NBSP}bn|12=00.000.000{NBSP}tn|15=00.000{NBSP}Qa|18=00{NBSP}Qi
+##digitsep .
+##digitsepcur .
 ##decimalsep ,
 ##winlangid 0x0438
 ##grflangid 0x12