so what is i18n, l10n and all that?

recently i have to install firefox but look at the packages and find this
firefox-13xxx
firefox-i18nxxx

so i dig on internet and find this:
Internationalization (i18n).
Localization (l10n).
Globalization (g11n).
Localizability (l12y).

“Internationalization is the design and development of a product, application or document content that enables easy localization for target audiences that vary in culture, region, or language.

Localization refers to the adaptation of a product, application or document content to meet the language, cultural and other requirements of a specific target market (a locale).”

the explination comes from here:

http://blog.mozilla.org/l10n/2011/12/14/i18n-vs-l10n-whats-the-diff/