RESOLUTION
Description: Sometimes it's needed to change localization of some message, button or description in Control Panel, for example to customize them for specific Provider needs or to fix grammer/syntax error.
Resolution: Create and upload customized locale files.
Note: Localization CP package should be installed prior on correspondent GUI host.
Go to Top > System Director > Configuration Manager > Internationalization & Localization screen > Select needed localization here (for example, Dutch) > Source Locale Files tab > Download needed locale file here (for example to change IP Type record in CP from "Exclusive" to "Exclusief" download file com.plesk.p2.cp.ext.http.apache.modules.resources.properties.DialogBundle.properties) and find needed parameter (for exclusive IP type it will be "IP_BASED.VALUE = Exclusive").
Create local file with name YourValueHereBundle.properties with new value for needed parameter, for example for IP_BASED.VALUE:
IP_BASED.VALUE = Exclusief Move to Customized Locale Files tab > Press "Add" button > Upload YourValueHereBundle.properties file from your local computer.
Note, to view new localization you should relogin the Control Panel.