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

Currently translated at 7.5% (6 of 79 strings)

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

Author: andibing

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

@@ -5,4 +5,8 @@
     <string name="phone_storage_hidden">Phone storage (not visible by other apps)</string>
     <string name="search_contacts">Search contacts</string>
     <string name="search_favorites">Search favourites</string>
+    <plurals name="delete_groups">
+        <item quantity="one">%d group</item>
+        <item quantity="other">%d groups</item>
+    </plurals>
 </resources>