Clean up test PDF references
Recompressed PNG assets
Merge pull request #4001 from jryans/clean-test-pdfs

Clean up test PDF references
Only trigger warning bar on certain unsupported features.
Merge pull request #4067 from fkaelberer/PNGs_recompressed

Recompressed PNG assets
Merge pull request #4048 from brendandahl/unsupported-features

Only trigger warning bar on certain unsupported features.
Update Spanish translation

Sync with latest changes and tweak a string for clarity
Merge pull request #4075 from Fitoschido/patch-1

Update Spanish translation