1.2.3

• improved panel layout and image sizing (by @Binnette, cf #824)
• upgraded Django to 2.2.17 and Pillow 8.0.1 (which drops support for python 3.5)
• experimental fallback handling in templating (cf #820)
• fixed search URL, and allow to control it from settings (cf #842)
• fixed map frozen when setting by hand invalid coordinates (cf #799)
• fixed changing map ownership (cf #780)
• do not change map zoom when locating user (cf #763)
• update map extent on first save if it has not been changed yet (cf #841)