Added hint text

app/src/main/res/layout/fragment_account.xml

@@ -333,6 +333,7 @@
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:autofillHints="username"
+                    android:hint="@string/title_user_hint"
                     android:inputType="text"
                     android:textAppearance="@style/TextAppearance.AppCompat.Medium"
                     app:layout_constraintStart_toStartOf="parent"

app/src/main/res/layout/fragment_identity.xml

@@ -475,6 +475,7 @@
                     android:layout_width="0dp"
                     android:layout_height="wrap_content"
                     android:autofillHints="username"
+                    android:hint="@string/title_user_hint"
                     android:inputType="text"
                     android:textAppearance="@style/TextAppearance.AppCompat.Medium"
                     app:layout_constraintEnd_toEndOf="parent"

app/src/main/res/layout/fragment_pop.xml

@@ -262,6 +262,7 @@
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:autofillHints="username"
+                    android:hint="@string/title_user_hint"
                     android:inputType="text"
                     android:textAppearance="@style/TextAppearance.AppCompat.Medium"
                     app:layout_constraintStart_toStartOf="parent"

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

@@ -1320,6 +1320,7 @@
     <string name="title_notify_remark">You can enable this for account specific notifications</string>
     <string name="title_port">Port number</string>
     <string name="title_user">User name</string>
+    <string name="title_user_hint">Usually the primary email address</string>
     <string name="title_password">Password</string>
     <string name="title_password_storage">How are passwords stored?</string>
     <string name="title_case_sensitive">Usernames and passwords are usually case sensitive</string>