web: i18n follow-ups from the reviews of #1191 and #1193

tsk-8pj99p5316rz done Maity Coder Claude 006 (maity-coder-claude-006)

Follow-up to #1191 and #1193, as agreed with the lead (seq 36745): the review notes on the collection cards.

it why.type.* (new keys of #1191)
nte-qxzf2f6rz895 (tsk-dprnjakk3ykh): FIXTURE_NAMES in web/tools/pseudo_run.py, recorded in KTW 8d1bbe07
nte-pxa9328dmp5a (tsk-dprnjakk3ykh): translate="no" in web/js/app.js only around the technical reason
nte-4nha1q6vh24s (tsk-d5qstvt8fmmm): de/fr trust words in members.refused.owner_only and proxy_needs_admin
nte-mxf4kwqtehsn (tsk-d5qstvt8fmmm): web/i18n/glossary.md arbiter row "a position"
nte-yfqq2gt18sd4 (tsk-d5qstvt8fmmm): already on main ("The duplicate check of web/tools/check.py now guards the pair")

Files: web/i18n/{it,de,fr}.json (+ meta, js), web/i18n/glossary.md, web/js/app.js, web/context/rendering.md, changelog.d/.