[IOS][Language] Language Settings - Refresh cell heights in edit mode

Fixes a bug where the leading language labels were being cut off because
the cells were not adapting their heights in edit mode.

Bug: 957688,967658
Change-Id: I6f8abab90b77565c71dcedc9cc4648a433ec324c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635933Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664622}

ios/chrome/browser/ui/settings/language/language_settings_table_view_controller.mm

@@ -149,6 +149,12 @@ typedef NS_ENUM(NSInteger, ItemType) {
 - (void)updateUIForEditState {
   [super updateUIForEditState];
 
+  // The following two lines cause the table view to refresh the cell heights
+  // with animation without reloading the cells. This is needed for language
+  // cells that can be significantly taller in edit mode.
+  [self.tableView beginUpdates];
+  [self.tableView endUpdates];
+
   [self setAddLanguageItemEnabled:!self.isEditing];
   [self setTranslateSwitchItemEnabled:!self.isEditing];
 }