Fix sentence capitalization of locale names.

It turns out that out previous CL [1] is not sufficient to address all
the requests regarding capitalization.

With [1], now InputMethodSubtype#getLocaleDisplayName() returns a locale
name whose capitalization is basically optimized to be used as a list
item.  It works well for list UI, but on a UI element that looks like a
sentence text, we still need to capitalize the first character.

This CL takes care of those UI elements in the Settings app.  This CL
also addresses a remaining TODO about locale-unaware text formatting by
using about android.icu.text.ListFormatter.

  [1]: If105082ce703db7a86738455db7e9fb37f3c6fe8
       e489baf96df2837a3a63b626d9023a4a8b322c28

Bug: 29035638
Change-Id: I59f93f0bc067cdd87c6065c972a7da3cde1128f9

src/com/android/settings/inputmethod/InputMethodAndLanguageSettings.java

@@ -758,22 +758,10 @@ public class InputMethodAndLanguageSettings extends SettingsPreferenceFragment
             final int inputMethodCount = (inputMethods == null ? 0 : inputMethods.size());
             for (int i = 0; i < inputMethodCount; ++i) {
                 InputMethodInfo inputMethod = inputMethods.get(i);
-
-                StringBuilder builder = new StringBuilder();
                 List<InputMethodSubtype> subtypes = inputMethodManager
                         .getEnabledInputMethodSubtypeList(inputMethod, true);
-                final int subtypeCount = subtypes.size();
-                for (int j = 0; j < subtypeCount; j++) {
-                    InputMethodSubtype subtype = subtypes.get(j);
-                    if (builder.length() > 0) {
-                        builder.append(',');
-                    }
-                    CharSequence subtypeLabel = subtype.getDisplayName(context,
-                            inputMethod.getPackageName(), inputMethod.getServiceInfo()
-                                    .applicationInfo);
-                    builder.append(subtypeLabel);
-                }
-                String summary = builder.toString();
+                String summary = InputMethodAndSubtypeUtil.getSubtypeLocaleNameListAsSentence(
+                        subtypes, context, inputMethod);
 
                 ServiceInfo serviceInfo = inputMethod.getServiceInfo();
                 ComponentName componentName = new ComponentName(serviceInfo.packageName,