fix #312: [FR] Handle the 'dérision' template

[lasconic]

• Fixes [FR] Handle the 'dérision' template #312
• 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 0.15%.

Quality metrics	Before	After	Change
Complexity	161.52 ⛔	157.27 ⛔	-4.25 👍
Method Length	675.00 ⛔	662.33 ⛔	-12.67 👍
Working memory	56.28 ⛔	57.61 ⛔	1.33 👎
Quality	5.40% ⛔	5.55% ⛔	0.15% 👍

Other metrics	Before	After	Change
Lines	1077	1063	-14

Changed files	Quality Before	Quality After	Quality Change
scripts/lang/fr/init.py	5.40% ⛔	5.55% ⛔	0.15% 👍

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

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
scripts/lang/fr/init.py	last_template_handler	174 ⛔	1120 ⛔	26 ⛔	1.64% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions

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