Feat
- adds minimum resolution of 144p for videos, export ffmpeg parameters in settings.py, add Transcoding.md doc with instructions around transcoding, set default ffmpeg preset for 720p and bigger resolutions to medium (used to be faster) - #1312 . Fixes #1311
- add version in css/js to avoid caching- #1318
- add DB connection pooling - #1315
- add Slovenian translation - #1306