feat(ci): Wiktionary dump template

.github/ISSUE_TEMPLATE/template-dump.md

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+---
+name: Wiktionary dump
+about: Issue to list changes in a Wiktionary dump.
+title: '🥮 Issues found in the `2024-MM-DD` dump'
+labels: 'dump'
+assignees: ''
+
+---
+
+> 🧙‍♂️ All-in-one ticket listing new missing templates, errors, and variants problems, accross all locales, following the latest Wikimedia dump.
+> Feel free to comment if you are interested in tackling one ticket, so that we do not work both on the same thing.
+
+<!-- Remove empty sections. -->
+
+## CA
+
+- [ ] 
+
+## DA
+
+- [ ] 
+
+## DE
+
+- [ ] 
+
+## EL
+
+- Unhandled templates count: N (📈 +N since `2024-MM-DD` dump | 📉 -N since `2024-MM-DD` dump)
+
+## EN
+
+- [ ] 
+
+## EO
+
+- [ ] 
+
+## ES
+
+- [ ] 
+
+## FR
+
+- [ ]
+
+## IT
+
+- [ ] 
+
+## NO
+
+- [ ] 
+
+## PT
+
+- [ ] 
+
+## RO
+
+- [ ] 
+
+## RU
+
+- [ ] 
+- Unhandled templates count: N (📈 +N since `2024-MM-DD` dump | 📉 -N since `2024-MM-DD` dump)
+
+## SV
+
+- [ ]