Adding language correction file for Germany (deu).

(cherry picked from commit c7047139f8b06b5ac1fe0f2bd5d36b0d6bbe36ca)
Increasing field length of page_lable to 40 chars.

The german translation takes 33 chars. This breaks saving the ocr
result.

(cherry picked from commit 029868c3d8cb07b2a2a192177f126a56e4bd6775)
Merge pull request #72 from mbehrle/feature/ocr_de

Feature/ocr de
Adding the possibility to use multiple language backends of tesseract.

Defining a new setting TESSERACT_CLEANUP_LANGUAGE for configuration of the
cleanup language file to use. Tesseract itself can use multiple
backends.

(cherry picked from commit b23c4bd833f61768faac4d2b4ca7957a0705e4ea)
Merge pull request #73 from mbehrle/feature/ocr_de

Adding the possibility to use multiple language backends of tesseract.