Audio replay gain bug

Description

1. I think there is a bug in "--audio-replay-gain-*" options. Depending on system language it can convert float values to string using comma insted of point (e.g. "-7,0"). That leads to a crash.
2. I've tried to play with it. My main goal is to make quiet voices louder. Replay gain doesn't make a difference unless you turn off peak protection, but then you get louder but very distorted audio.

I've tested VLC desctop and found that Dynamic range compression does the job just right. As far as I can tell "--compressor-*" options don't work in libvlc Android, correct? Is there a chance it gets to libvlc Android any time soon? I found 2 old tickets #888 and #1917 . But it doesn't look like they are considered to be included in any milestone.

Expected behavior

No crash

Actual behavior

Crash

Steps to reproduce

1. Change system language to any that uses comma floating point separator
2. Set some values for relay gain