Locale is an XML file containing entries grouped into sections, which fully describe the interface of the program.
Section groups together a number of entries, typically applicable to some subset of UI. Plesk Expand locale contains four sections:
context_help_variablesThis section defines special values effective for messages of the context_help_keys section.
context_help_keysThis section contains localization for messages displayed in the context help section of the Plesk Expand navigation pane. When you point to an interface element, you can see a short description of this element and available operations.
messages_variablesThis section defines special values effective for messages of the messages_keys section.
messages_keysThis section contains localization for various interface elements names and notifications.
Entry is a "keyword-phrase-comment" triplet, which specifies localization for a single element of the Plesk Expand UI.
Keyword is an internal name that Plesk Expand uses to match the UI element, so never change the contents of this tag.
Phrase tag contains the text to be displayed in the UI. This is the text you are going to translate into your language.
Comment tag does not affect the Plesk Expand UI, but helps other people understand the purpose of the entry and the reasons for the phrase content.