OneSky Dev

How to localize iOS Apps

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Super easy iTunes Metadata translation

Tutorial from Apple

https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/LoadingResources/Strings/Strings.html

Examples:

The format does not support contexts like singular, plural.
Localizable.strings 
/* No comments from developer */
"string_key_1"="Home";

/* Welcome message */
"string_key_2"="Welcome, %@";
zh_TW/Localizable.strings 
/* No comments from developer */
"string_key_1"="首頁";

/* Welcome message */
"string_key_2"="%@，歡迎你";

More...

OneSky provides a way to update your translations over-the-air without re-submitting your Apps, check out here!