Fix #2095, #1471, #803 - fix fence_type vs material warning

[Famlam]

1. Lower the priority of the Fence with material tag, better use fence_type tag warning (Should "Fence with material tag" really be level 1? #2095)
2. Make clear that the intention is to add a fence_type, not to remove the material (e.g. fence_type=chain_link + material=metal) (Fence type vs. material #1471, #303210: barrier=fence and material #803)
3. Convert to mapcss so it can also be loaded into JOSM. (Uses placeholders to avoid people from translating material or fence_type; also drops the tag highway (unrelated) and the tag fix:chair (as from my chair I probably won't be able to distinguish values like barbed_wire from wire; usually it'll require a survey)

[frodrigo]

Nice. Thank you.

[Famlam]

@frodrigo Did I do something wrong?
It seems that the subtitle of the issues now contains Fence with material tag, also add fence_type (as expected, this is the new text), but the title is still Fence with material tag, better use fence_type tag (the old title), and the priority is still "high" (instead of low) and the link still refers to TagFix_MultipleTag.py instead of TagFix_MultipleTag2.validator.mapcss.

Example:
https://osmose.openstreetmap.fr/en/issue/5607e6f7-cd01-7fda-9b08-45610d0c4bca

[frodrigo]

@frodrigo Did I do something wrong? It seems that the subtitle of the issues now contains Fence with material tag, also add fence_type (as expected, this is the new text), but the title is still Fence with material tag, better use fence_type tag (the old title), and the priority is still "high" (instead of low) and the link still refers to TagFix_MultipleTag.py instead of TagFix_MultipleTag2.validator.mapcss.

Example: https://osmose.openstreetmap.fr/en/issue/5607e6f7-cd01-7fda-9b08-45610d0c4bca

It is now OK.

[Famlam]

Thanks! Only the link is incorrect, but that's because the fix hasn't been merged into master yet