When an Excel table contains a column header that cannot be resolved to a known language name (or an annotated field header) , the program first checks the settings file, and if nothing is found there, asks the user to select whether it is a language or a field. The same steps are taken if there is anything else that cannot be automatically determined in any format. The field definition dialog is described in detail in its own topic.
You can also use the field definition to ignore languages and fields from any file you convert.
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