feat(bisaya-course): expand numerical didactics with additional glosses

- Added new glosses for numbers in Bisaya, enhancing the didactics for numerical lessons.
- Included translations for numbers 4 to 19, improving the comprehensiveness of the numerical curriculum.
- Updated the lesson structure to support the expanded vocabulary, ensuring a richer learning experience.

backend/scripts/update-bisaya-didactics.js

@@ -320,7 +320,22 @@ export const LESSON_DIDACTICS = {
       { target: 'Usa', gloss: 'eins' },
       { target: 'Duha', gloss: 'zwei' },
       { target: 'Tulo', gloss: 'drei' },
+      { target: 'Upat', gloss: 'vier' },
+      { target: 'Lima', gloss: 'fuenf' },
+      { target: 'Unom', gloss: 'sechs' },
+      { target: 'Pito', gloss: 'sieben' },
+      { target: 'Walo', gloss: 'acht' },
+      { target: 'Siyam', gloss: 'neun' },
       { target: 'Napulo', gloss: 'zehn' },
+      { target: 'Napulo ug usa', gloss: 'elf' },
+      { target: 'Napulo ug duha', gloss: 'zwoelf' },
+      { target: 'Napulo ug tulo', gloss: 'dreizehn' },
+      { target: 'Napulo ug upat', gloss: 'vierzehn' },
+      { target: 'Napulo ug lima', gloss: 'fuenfzehn' },
+      { target: 'Napulo ug unom', gloss: 'sechzehn' },
+      { target: 'Napulo ug pito', gloss: 'siebzehn' },
+      { target: 'Napulo ug walo', gloss: 'achtzehn' },
+      { target: 'Napulo ug siyam', gloss: 'neunzehn' },
       { target: 'Baynte', gloss: 'zwanzig' }
     ],
     speakingPrompts: [