Make need for additional PIN at end of security code (after OTP) more obvious

* change hint for code checking edit field to indicate need for PIN
* add additional text about how code is constructed from OTP token and PIN
* change PIN preference label - add that it is mandatory
* add "followed by PIN" to text sent via SMS

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

@@ -46,6 +46,15 @@
                 style="@style/section_header_label"
                 android:text="@string/smscommunicator_otp_step3_test_header" />
 
+            <TextView
+                android:layout_width="fill_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="5sp"
+                android:layout_marginBottom="5sp"
+                android:paddingStart="15sp"
+                android:paddingEnd="15sp"
+                android:text="@string/smscommunicator_code_verify_info" />
+
             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
@@ -56,13 +65,13 @@
                     android:layout_height="wrap_content"
                     android:paddingStart="15dp"
                     android:paddingEnd="5dp"
-                    android:text="@string/smscommunicator_otp_verify_label" />
+                    android:text="@string/smscommunicator_code_verify_label" />
 
                 <EditText
                     android:id="@+id/smscommunicator_otp_verify_edit"
                     android:layout_width="140sp"
                     android:layout_height="wrap_content"
-                    android:hint="000 000 000"
+                    android:hint="@string/smscommunicator_code_verify_hint"
                     android:inputType="number"
                     android:maxLength="12"
                     android:textAlignment="center"

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

@@ -1353,15 +1353,18 @@
     <string name="key_smscommunicator_otp_password" translatable="false">smscommunicator_otp_password</string>
     <string name="key_smscommunicator_otp_secret" translatable="false">smscommunicator_otp_secret</string>
 
-    <string name="smscommunicator_code_from_authenticator_for" comment="This is continuation of sentence: To [ACTION] reply with code">from Authenticator app for: %1$s</string>
+    <string name="smscommunicator_code_from_authenticator_for" comment="This is continuation of sentence: To [ACTION] reply with code">from Authenticator app for: %1$s followed by PIN</string>
 
     <string name="smscommunicator_otp_enabled">Enable Authenticator</string>
     <string name="smscommunicator_otp_enabled_summary">Authenticate commands using One Time Passwords generated by Google Authenticator or similar 2FA apps.</string>
-    <string name="smscommunicator_otp_pin">Additional PIN at token end</string>
+    <string name="smscommunicator_otp_pin">Additional mandatory PIN at token end</string>
     <string name="smscommunicator_otp_pin_summary">Additional digits that should be memorised and glued at end of each generated One Time Password</string>
 
     <string name="smscomunicator_tab_otp_label">Authenticator setup</string>
 
+    <string name="smscommunicator_code_verify_label">Code to check:</string>
+    <string name="smscommunicator_code_verify_hint">OTP + PIN</string>
+    <string name="smscommunicator_code_verify_info">The verification code consist of 6 digits displayed by Authenticator app (known as OTP) followed by 3 or more digits of mandatory PIN.</string>
     <string name="smscommunicator_otp_verify_label">OTP to check:</string>
     <string name="smscommunicator_otp_reset_btn">Reset Authenticators</string>
     <string name="smscommunicator_otp_reset_title">Reset Authenticator Key</string>

app/src/main/res/xml/pref_smscommunicator.xml

@@ -35,13 +35,6 @@
             android:title="@string/smscommunicator_otp_enabled"
             app:isPreferenceVisible="false" />
 
-        <Preference
-            android:dependency="@string/key_smscommunicator_remotecommandsallowed"
-            android:key="otpsetup"
-            android:title="@string/smscomunicator_tab_otp_label">
-            <intent android:action="info.nightscout.androidaps.plugins.general.smsCommunicator.activities.SmsCommunicatorOtpActivity" />
-        </Preference>
-
         <info.nightscout.androidaps.utils.textValidator.ValidatingEditTextPreference
             android:dependency="@string/key_smscommunicator_remotecommandsallowed"
             android:key="@string/key_smscommunicator_otp_password"
@@ -49,6 +42,13 @@
             android:title="@string/smscommunicator_otp_pin"
             validate:testType="pinStrength" />
 
+        <Preference
+            android:dependency="@string/key_smscommunicator_remotecommandsallowed"
+            android:key="otpsetup"
+            android:title="@string/smscomunicator_tab_otp_label">
+            <intent android:action="info.nightscout.androidaps.plugins.general.smsCommunicator.activities.SmsCommunicatorOtpActivity" />
+        </Preference>
+
     </PreferenceCategory>
 
 </androidx.preference.PreferenceScreen>