Updated Polish translation
Updated Russian translation
Updated Russian translation
Remove setting the font in the PDF generation

It needs to be improved.
Improve the text lines split in PDF generation
Implement select next/previous page
Implement move page up or down
Refactor how the main window is notified of the existence of pages

Instead of just saying that is has images or not, it now needs to
know the number of images.
Make selecting/moving pages dependent on the number of pages

They need to be enabled only if there are more than 1 page loaded.
Move menubar UI XML to a separate file
Move getTextFromBoxes function to the page class
Implement addPage method to PlaintextGenerator
Add DocumentGeneratorManager class
Register document generators in DocumentGeneratorManager
Use DocumentGeneratorManager to get the needed generators

Also use the generators in a more abstract way so there is no
need to implement a function for each exportation.
Refactor DocumentGenerator's constructor
Add all exportation formats to the CLI version of OCRFeeder
Remove auto-generated gnome-doc-utils.make from Git
Updated Polish translation
Updated Slovenian translation