fix #683: [FR] Better support for 'siècle' template with I

[lasconic]

• Fixes [FR] Better support for 'siècle' template with I #683
• Tests added/updated.
• ./check.sh run and eventual issues fixed.
• Updated CONTRIBUTORS.md, if not already done in the past.

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.28%.

Quality metrics	Before	After	Change
Complexity	15.58 🙂	16.07 🙂	0.49 👎
Method Length	80.29 🙂	79.24 🙂	-1.05 👍
Working memory	9.88 😞	9.76 🙂	-0.12 👍
Quality	57.43% 🙂	57.71% 🙂	0.28% 👍

Other metrics	Before	After	Change
Lines	739	748	9

Changed files	Quality Before	Quality After	Quality Change
wikidict/lang/fr/template_handlers.py	57.43% 🙂	57.71% 🙂	0.28% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
wikidict/lang/fr/template_handlers.py	render_compose_de	55 ⛔	489 ⛔	15 😞	11.45% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
wikidict/lang/fr/template_handlers.py	render_etyl	17 🙂	161 😞	10 😞	46.13% 😞	Try splitting into smaller methods. Extract out complex expressions
wikidict/lang/fr/template_handlers.py	render_mot_valise	13 🙂	126 😞	10 😞	53.27% 🙂	Try splitting into smaller methods. Extract out complex expressions
wikidict/lang/fr/template_handlers.py	render_cit_ref	10 🙂	169 😞	8 🙂	55.58% 🙂	Try splitting into smaller methods
wikidict/lang/fr/template_handlers.py	render_agglutination	12 🙂	102 🙂	10 😞	57.22% 🙂	Extract out complex expressions

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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