Key

Unique key name. You will use this key in localization macros.

Text

Text of the string to be displayed in the currently edited UI culture.

If there are any machine translation services currently enabled, matching icons will be displayed next to the editing area. By clicking on these icons, you can have the value translated from the default culture using the corresponding service.

Default text

Shows the text of the string in the default UI culture.

Custom string

If checked, your string will automatically be exported with your websites.