lingos:: // The package name
auth. // The language file name
register // The phrase or word that you want to call
auth :: relates to authorization and security
button :: relates to various words appearing on buttons
general :: relates to various often used words and phrases
emails :: relates to email template phrases and words
table :: relates to various words appearing in tables
sentry :: relates to various words that sentry 2 uses
Note: Sometimes you have words or phrases that can fall into both the button and general categories.
I separated these since you might want to have them slightly different, like capitalizations or similar.