Add 2 dictées for the accords-du-groupe-nominal chapter

Only 1 existed, below the prompt-lancement.md minimum of 3 per
chapter. Adds difficulty 2 (feminine singular) and difficulty 3
(feminine plural, noun and adjective separated by a complement,
mirroring points 18/23). Audio generated with the Piper voice
(make generate-dictation-audio), credited in assets/CREDITS.md.

With this, regle_accord_adjectif now meets prompt-lancement.md's
minimum content volume: 8 multiple-choice, 4 sentence corrections,
3 dictées.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

assets/audio/dictations/ce1_accord_adjectif_dictee_02.ogg.import

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+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://0vyppl8vr8rs"
+path="res://.godot/imported/ce1_accord_adjectif_dictee_02.ogg-5adbd8bcb234bc46338ec445d7172240.oggvorbisstr"
+
+[deps]
+
+source_file="res://assets/audio/dictations/ce1_accord_adjectif_dictee_02.ogg"
+dest_files=["res://.godot/imported/ce1_accord_adjectif_dictee_02.ogg-5adbd8bcb234bc46338ec445d7172240.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

assets/audio/dictations/ce1_accord_adjectif_dictee_03.ogg.import

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+[remap]
+
+importer="oggvorbisstr"
+type="AudioStreamOggVorbis"
+uid="uid://tybbbqikgjs6"
+path="res://.godot/imported/ce1_accord_adjectif_dictee_03.ogg-9a1643c1ffcd0c2252fbfcb169155612.oggvorbisstr"
+
+[deps]
+
+source_file="res://assets/audio/dictations/ce1_accord_adjectif_dictee_03.ogg"
+dest_files=["res://.godot/imported/ce1_accord_adjectif_dictee_03.ogg-9a1643c1ffcd0c2252fbfcb169155612.oggvorbisstr"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4