Don't localize double numbers in the webui. Closes #1525.

Conflicts:
	src/misc.h
	src/webui/btjson.cpp
Revert "Fix WebUI sort by ratio for some locales (with comma as decimal point)."

This reverts commit ef328f83c5026bc8a5e72ebac990f3ce67e72a85.
Revert "Fix WebUI sort by size/speed for some locales (with comma as decimal point)."

This reverts commit 6cf780f57c5db88ac1f879d4bfe566fa7a81f2b6.