There are two ways to request changes (for bug fixes or new features):
Collation sequences are particularly tricky; for more information see Collation Guidelines.
With a Survey Tool account, you can make changes only in the locales for which you are specifically enabled, not in arbitrary locales. If you want to report a problem or error in some locale, especially if you are not an expert in that locale, you don't need an account, you can simply file a ticket.
You may wish to obtain a Survey Tool account...
You probably do not need a Survey Tool account...
Sources and references may be standards or can also be dictionaries, journal style guides (such as The Economist Style Guide for English), and other available sources that provide guidance as to common practice. Online sources are preferred where available, since they can be more easily checked.
The goal is to follow common, customary practice. For example, language or territory display names should use the most recognizable name in common usage. This is generally not the official name. For example, one would use "Switzerland" not "Swiss Confederation".
Here are some possible resources for comparison of locale data. This is not an endorsement of the sources, merely a collation of possibly-useful links. To suggest additions to this list, file a Bug Report.
For English, The Economist Style Guide (unfortunately only hard copy):