PB-2241: implement new version of BABS signatures

[hansmannj]

Added new BABS signatures
Optimized handling of special characters and umlauts in sv2png.py and generate_babs_dict Added short section in README.md on requirements for filenames of new signatures Clearer implementation of the dryrun logic in the svg2png.py script

• TODO: Remember to unlist the old versions when deploying

[pakb]

Is there really a need for 3 separate dictionary files? They all contains all translation in the 3 languages.

[hansmannj]

Is there really a need for 3 separate dictionary files? They all contains all translation in the 3 languages.

Yes. Otherwise we'd have to change the service's logic and also the one in the frontend.
Probably can optimize things in SWISSGEO context, but not here and now.
It is the same way already with the v2 ones.
Also, the mouseover texts are in all 3 languages for each icon inside the dictionary, right.
But the filename is contained only once - in the language of the dictionary.

[pakb]

Probably can optimize things in SWISSGEO context

I think we can safely write down in the future specs that we need to have a per-lang icon URL approach for each "icon", instead of what we currently have.

[rebert]

lgtm beside the remark with the 🪤