fix #239, #251 : Handle 'agglutination' and 'univerbation' template

[lasconic]

• Fixes [FR] Handle "agglutination" template #239
• Fixes [FR] Handle 'univerbation' template #251
• 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 0.25%.

Quality metrics	Before	After	Change
Complexity	115.84 ⛔	124.52 ⛔	8.68 👎
Method Length	562.00 ⛔	575.33 ⛔	13.33 👎
Working memory	65.73 ⛔	63.85 ⛔	-1.88 👍
Quality	7.08% ⛔	6.83% ⛔	-0.25% 👎

Other metrics	Before	After	Change
Lines	917	940	23

Changed files	Quality Before	Quality After	Quality Change
scripts/lang/fr/init.py	7.08% ⛔	6.83% ⛔	-0.25% 👎

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	142 ⛔	897 ⛔	25 ⛔	1.94% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions

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