chore(translation): fix Dutch translation for 'Theme'

i18n/nl.json

@@ -235,5 +235,5 @@
     "Link copied to clipboard": "Link gekopieerd naar klembord",
     "Paste text": "Tekst plakken",
     "Tabulator key serves as character (Hit <kbd>Ctrl</kbd>+<kbd>m</kbd> or <kbd>Esc</kbd> to toggle)": "Tabulatortoets dient als teken (gebruik <kbd>Ctrl</kbd>+<kbd>m</kbd> of <kbd>Esc</kbd> om te schakelen)",
-    "Theme": "Theme"
+    "Theme": "Thema"
 }