Misc. Bug fixes and Translation Improvments (#926)

* Fixes [BUG] Editing a location removes it from all the collections
Fixes #893

* Add new translations for Chinese and Ukrainian locales

- Updated zh.json to include new keys: "about_country", "about_region", "show_less", and "show_more".
- Registered Ukrainian locale in +layout.svelte and added it to the locales array.

* Update translation for 'back' in Dutch locale (#917)

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Co-authored-by: Sille Van Landschoot <979071+sillevl@users.noreply.github.com>

frontend/src/locales/nl.json

@@ -291,7 +291,7 @@
     "average_cadence": "Gemiddelde cadans",
     "average_speed": "Gemiddelde snelheid",
     "avg_speed": "Gemiddelde snelheid",
-    "back": "Rug",
+    "back": "Terug",
     "cadence": "Cadans",
     "calories": "Calorieën",
     "click_map": "Klik op de kaart om een locatie te selecteren",
@@ -579,7 +579,11 @@
     "spin_again": "Weer spinnen",
     "spinning_globe": "Spinnende bol",
     "try_again": "Probeer het opnieuw",
-    "your_random_adventure_awaits": "Je willekeurige avontuur wacht!"
+    "your_random_adventure_awaits": "Je willekeurige avontuur wacht!",
+    "about_country": "Over land",
+    "about_region": "Over Regio",
+    "show_less": "Toon minder",
+    "show_more": "Toon meer"
   },
   "settings": {
     "account_settings": "Gebruikersaccount instellingen",