Clicking "More" on tabLayout caused it to be displayed on toolbar (in any other language than English) (#4666)

* Changed hardcoded "More" to getStrings(R.string.more) for Unlogged user
- MainActivity toolbar showed "More" when clicked on More options
   in other language than English

* Changed hardcoded "More" to getStrings(R.string.more) for Logged user
- MainActivity toolbar showed "More" when clicked on More options
   in other language than English

* Added test for: MainActivity.setUpPager

app/src/test/kotlin/fr/free/nrw/commons/contributions/MainActivityUnitTests.kt

@@ -210,6 +210,16 @@ class MainActivityUnitTests {
         activity.toggleLimitedConnectionMode()
     }
 
+    @Test
+    @Throws(Exception::class)
+    fun testSetUpPager() {
+        val method: Method = MainActivity::class.java.getDeclaredMethod(
+            "setUpPager"
+        )
+        method.isAccessible = true
+        method.invoke(activity)
+    }
+
     @Test
     @Throws(Exception::class)
     fun testSetUpLoggedOutPager() {