fix #335: [FR] Support 'locutions latines' template

[lasconic]

• Fixes [FR] Support 'locutions latines' template #335
• 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 leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	195.25 ⛔	195.25 ⛔	0.00
Method Length	793.00 ⛔	793.67 ⛔	0.67 👎
Working memory	52.58 ⛔	52.71 ⛔	0.13 👎
Quality	4.26% ⛔	4.26% ⛔	0.00%

Other metrics	Before	After	Change
Lines	1173	1174	1

Changed files	Quality Before	Quality After	Quality Change
scripts/lang/fr/init.py	4.26% ⛔	4.26% ⛔	0.00%

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	211 ⛔	1500 ⛔	28 ⛔	1.20% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions

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