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

Currently translated at 5.7% (15 of 261 strings)

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

Author: andibing

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

@@ -13,4 +13,12 @@
     <string name="event_color">Event colour</string>
     <string name="default_calendar_color">Default calendar colour</string>
     <string name="task_color">Task colour</string>
+    <plurals name="within_the_next_weeks">
+        <item quantity="one">Within the next %d week</item>
+        <item quantity="other">Within the next %d weeks</item>
+    </plurals>
+    <plurals name="within_the_next_months">
+        <item quantity="one">Within the next %d month</item>
+        <item quantity="other">Within the next %d months</item>
+    </plurals>
 </resources>