I.R.I.S. Readiris Corporate 12 for Mac User Guide - Manual (Page 54)

Chapter 8 – Recognizing documents
48
Recognizing documents with mixed languages
Readiris also allows you to enable mixed character sets. That way
Readiris switches languages in the middle of a sentence
automatically and recognizes English words (proper names etc.)
that occur in "exotic" languages.
Click the globe button on the main toolbar and select the required
language combination in the Primary language list.
Note: when processing Asian or Hebrew documents, mixed
characters sets are used automatically.
Recognizing secondary languages
Next to the primary language or language combination, Readiris
allows you to select up to 4 secondary languages of the same
language group.
This is useful when recognizing multilingual documents.
Based on the primary language you select, Readiris displays a list of
available secondary languages.
Note: do not select languages that do not apply; the bigger the
character set, the slower the recognition and the higher the risk of
OCR errors.
Selecting the language per page
When specific pages use a different language than the overall
document, you don't need to define a secondary language. You can
apply a different language to those pages.
Select the pages in the drawer, Ctrl-click them and use the
command Language to assign another language than the overall
document language to that/those page/pages.