Translated using Weblate (Finnish)

Currently translated at 100.0% (12 of 12 strings)
Add translation templates for swedish.
Translated using Weblate (Finnish)

Currently translated at 8.1% (16 of 197 strings)
Merge remote-tracking branch 'origin/master'
Free images before going to next page.

This fixes an issue where all image data was leaked when moving
forward/backward in the user interface.
Make duplex->simplex fallback a bit less confusing.
Use input rather than include for code128.tex

Without this LaTeX only produces a warning if the file is missing,
which makes it hard to figure out what is going wrong.
Run validation in LaTeX setup.
Translated using Weblate (French)

Currently translated at 3.0% (6 of 197 strings)