Made Facebook, Google and Email buttons have their text as their corresponding sign_in_with_* resource string.

Author: Gloix

auth/src/main/res/layout/auth_method_picker_layout.xml

@@ -25,7 +25,7 @@
         <Button
             android:id="@+id/email_provider"
             style="@style/FirebaseUI.Button.AccountChooser.EmailButton"
-            android:text="@string/email_button_text"/>
+            android:text="@string/sign_in_with_email"/>
 
     </LinearLayout>
 

auth/src/main/res/layout/idp_button_facebook.xml

@@ -1,6 +1,6 @@
 <Button
     xmlns:android="http://schemas.android.com/apk/res/android"
     style="@style/FirebaseUI.Button.AccountChooser.FacebookButton"
-    android:text="Sign in with Facebook"
+    android:text="@string/sign_in_with_facebook"
     android:id="@+id/facebook_button"
     />

auth/src/main/res/layout/idp_button_google.xml

@@ -1,6 +1,6 @@
 <Button
     xmlns:android="http://schemas.android.com/apk/res/android"
     style="@style/FirebaseUI.Button.AccountChooser.GoogleButton"
-    android:text="Sign in with Google"
+    android:text="@string/sign_in_with_google"
     android:id="@+id/google_button"
     />

auth/src/main/res/values/strings.xml

@@ -1,5 +1,4 @@
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
-    <string name="email_button_text">Sign in with email</string>
     <string name="app_name">ui_flow</string>
     <string name="email_hint">Email</string>
     <string name="sign_in_no_password_title">Put an email to use for sign in</string>