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There's an easy way to get just a little better at accessibility:

1) Get a text expander. In OS X and iOS you can do this natively in System Preferences > Keyboard; I'm not sure about other OSes.
2) Create the following replacements:

"i18n" -> "internationalization"
"l10n" -> "localization"
"a11y" -> "accessibility"

Now you can type your shorthand AND be read by people who aren't fluent in Lazy Jargon.