config editors can crash if locale 'en_GB' misses

[amak79]

When starting gimx-fpsconfig I get the following message:

18:20:48: Cannot set locale to language "English".
18:20:48: locale 'en_GB' cannot be set.
18:20:48: Cannot set locale to language "English".
18:20:48: locale 'en_GB' cannot be set.
18:20:48: Cannot set locale to language "English".
18:20:48: locale 'en_GB' cannot be set.
18:20:48: Cannot set locale to language "English".
18:20:48: locale 'en_GB' cannot be set.
18:20:48: Cannot set locale to language "English".
18:20:48: locale 'en_GB' cannot be set.
18:20:48: Cannot set locale to language "English".
18:20:48: locale 'en_GB' cannot be set.
18:20:48: Cannot set locale to language "English".
18:20:48: locale 'en_GB' cannot be set.
18:20:48: Cannot set locale to language "English".
18:20:48: locale 'en_GB' cannot be set.

My current available locales are:

$ locale -a
C
en_AU
en_AU.iso88591
en_AU.utf8
POSIX

Adding the en_GB locale makes the message go away. Is there a reason why gimx-fpsconfig needs the en_GB locale? I don't have this issue with gimx-config or gimx-launcher.

[matlo]

The configs use '.' as a decimal separator. The apps temporarily change the locale to en_GB in code sections that handle numbers with a decimal separator, to ensure numbers can only have '.' as a decimal separator. It is a mistake as this locale may not be available. This definitely needs to be fixed.

[matlo]

I just tried GIMX 6.8 without the en_GB locale on my system. It makes gimx-config crash.