Allow lazy install of locales

[NyakudyaA]

Locales are only currently used when setting up the data directory. This fix allows

• Deprecate GENERATE_ALL_LOCALE Arg

• Remove Arg LANG as we now split the LANGS to get the first LANG

• Lazy install of locales needed by the initDB command

Examples

docker run -e LANGS="fr_FR.UTF-8"  -e DEFAULT_COLLATION="fr_FR.UTF-8" -e DEFAULT_CTYPE="fr_FR.UTF-8" 

This will default the DEFAULT_COLLATION, DEFAULT_CTYPE to the first listed in langs

docker run -e LANGS="fr_FR.UTF-8,id_ID.UTF-8"

Fixes #527 by drastically reducing the build time