chore(l10n): update English (United Kingdom) translations

Currently translated at 2.6% (2 of 75 strings)

Translation: Fossify/Notes
Translate-URL: https://hosted.weblate.org/projects/fossify/notes/en_GB/
Via: Weblate

Author: andibing

app/src/main/res/values-en-rGB/strings.xml

@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="open_file">Open file</string>
+    <plurals name="num_checked_items">
+        <item quantity="one">%d checked item</item>
+        <item quantity="other">%d checked items</item>
+    </plurals>
 </resources>