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To enable this option, go to: Window > Preferences > JavaScript > Editor > Externalize Strings and check the Remove unused $NON-NLS$ tags on save option. 

Localized Formatting

Servoy allows setting locale formats on numbers, integers, and dates.

There are four levels of setting the locale format:

• Java Virtual Machine (JVM) level - setting the
• Servoy Application Server level - setting the Locale Settings on the Admin Page; the formats set will be applied to all fields that do not have a format set at table or field level.
•  table level - setting the Default format under Details tab on a column, in the Table Editor; the format set will be applied to all fields having the column as data provider, that do not have a format set on field level.
• field level - setting the format property of a field in Properties view.