Suppose you want to create a set of language files for "esperanto".
Create a folder /library/lang/esperanto. Do not capitalize the folder's name. When the login is displayed editwrx reads the names of the folders in the /lang folder to create the menu of languages to chose from.
Copy the library/lang/english folder (all files and sub folder) to the /library/lang/esperanto folder.
In each file in /library/lang/esperanto there will be a list of variableName=text. Translate the text for each variable. Keep in mind that the text must fit into a pre-defined space equal to the English version. Buttons will expand to accommodate the face text you use.
Automatic Updates do not contain non-English files. Your translation files in /library/lang/esperanto will not be altered by an Automatic Update. After an Automatic Update you may need to check the /lang/english folder to see if there are new files that need corresponding new translation files created.