fix #672: support doute parameter in 'siècle' template. Support 'litote' template

[lasconic]

• Fixes [FR] Support 'doute' parameter in 'siècle' template #672
• 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 decrease code quality in the affected files by 0.08%.

Quality metrics	Before	After	Change
Complexity	15.57 🙂	15.59 🙂	0.02 👎
Method Length	109.97 🙂	110.23 🙂	0.26 👎
Working memory	28.03 ⛔	28.14 ⛔	0.11 👎
Quality	53.76% 🙂	53.68% 🙂	-0.08% 👎

Other metrics	Before	After	Change
Lines	1501	1504	3

Changed files	Quality Before	Quality After	Quality Change
wikidict/lang/fr/init.py	32.55% 😞	32.55% 😞	0.00%
wikidict/lang/fr/template_handlers.py	57.49% 🙂	57.40% 🙂	-0.09% 👎

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	53 ⛔	492 ⛔	15 😞	11.72% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
wikidict/lang/fr/init.py	last_template_handler	22 😞	210 ⛔	18 ⛔	27.55% 😞	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

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