Firebase Phone Auth. Add localization strings description,

Change-Id: Ic0be081b0b1c3fa9307f207cde809cf3f32009a8

Author: yramanchuk

FirebaseFacebookAuthUI/Strings/en.lproj/FirebaseFacebookAuthUI.strings

@@ -1,2 +1,2 @@
-// The text of the button used to sign-in with Facebook.
+/* The text of the button used to sign-in with Facebook. */
 "SignInWithFacebook" = "Sign in with Facebook";

FirebaseGoogleAuthUI/Strings/en.lproj/FirebaseGoogleAuthUI.strings

@@ -1,2 +1,2 @@
-// The text of the button used to sign-in with Google.
+/* The text of the button used to sign-in with Google. */
 "SignInWithGoogle" = "Sign in with Google";

FirebasePhoneAuthUI/Strings/en.lproj/FirebasePhoneAuthUI.strings

@@ -1,42 +1,62 @@
-// The text of the button used to sign-in with Phone.
+/* The text of the button used to sign-in with Phone. */
 "SignInWithPhone" = "Sign in with phone";
 
+/* The title of view controller where user enters phone number. */
 "EnterPhoneTitle" = "Enter phone number";
 
+/* The title of button on navigation controller which navigates to previous screen. */
+"Back" = "Back";
+
+/* The title of button on navigation controller which navigates to the next screen. */
 "Next" = "Next";
 
+/* The title of button which user taps on phone verification screen. */
 "Verify" = "Verify";
 
+/* Alert message displayed when user submits empty verification code. */
 "EmptyVerificationCode" = "Verification code can't be empty.";
 
+/* Alert message displayed when user submits empty phone number. */
 "EmptyPhoneNumber" = "Phone number can't be empty.";
 
+/* Label next to the left of phone number entry field. */
 "PhoneNumber" = "Number";
 
+/* Placeholder shown for phone number input field. */
 "EnterYourPhoneNumber" = "Phone number";
 
+/* Label next to the left of country selector control. */
 "Country" = "Country";
 
+/* Text of the label shown on the verification screen describing that verification code was sent to phone number. */
 "EnterCodeDescription" = "Enter the %@-digit code we sent to";
 
+/* The title of button with resend verification code functionality. */
 "ResendCode" = "Resend code";
 
+/* Text of the resend timer label shown on verification phone number screen. */
 "ResendCodeTimer" = "Resend code in %@";
 
+/* The title of view controller where user verifies phone number. . */
 "VerifyPhoneTitle" = "Verify phone number";
 
+/* The title of button displayed when user closes alert message. */
+"Done" = "Done";
+
+/* The title of alert shown when user entered invalid phone number format. */
 "IncorrectPhoneTitle" = "Invalid phone number";
 
+/* The body message of alert shown when user entered invalid phone number format. */
 "IncorrectPhoneMessage" = "Try entering your phone number again.";
 
+/* The body message of alert shown when user tapped resend verification code button. */
 "ResendCodeResult" = "Code was sent to %@";
 
+/* The title of alert shown when user entered invalid verification code. */
 "IncorrectCodeTitle" = "Incorrect verification code";
 
+/* The body message of alert shown when user entered invalid verification code. */
 "IncorrectCodeMessage" = "Try entering your verification code again.";
 
-"Done" = "Done";
-
-"Back" = "Back";
-
+/* The body message of alert shown when internal server error appeared. */
 "InternalErrorMessage" = "Your request couldn't be completed. Try again later.";

FirebaseTwitterAuthUI/Strings/en.lproj/FirebaseTwitterAuthUI.strings

@@ -1,2 +1,2 @@
-// The text of the button used to sign-in with Twitter.
+/* The text of the button used to sign-in with Twitter. */
 "SignInWithTwitter" = "Sign in with Twitter";