Replace sgnl.link urls with a more readable url.

* Taken out random string, reverted to single "Let's switch".

#8767

res/values/strings.xml

@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="app_name">Signal</string>
+
+    <string name="install_url" translatable="false">https://signal.org/install</string>
+
     <string name="yes">Yes</string>
     <string name="no">No</string>
     <string name="delete">Delete</string>
@@ -158,7 +161,6 @@
     <string name="ConversationActivity_transport_insecure_mms">Insecure MMS</string>
     <string name="ConversationActivity_transport_signal">Signal</string>
     <string name="ConversationActivity_lets_switch_to_signal">Let\'s switch to Signal %1$s</string>
-    <string name="ConversationActivity_lets_use_this_to_chat">Let\'s use this to chat: %1$s</string>
     <string name="ConversationActivity_error_leaving_group">Error leaving group</string>
     <string name="ConversationActivity_specify_recipient">Please choose a contact</string>
     <string name="ConversationActivity_unblock_this_contact_question">Unblock this contact?</string>

src/org/thoughtcrime/securesms/InviteActivity.java

@@ -76,7 +76,7 @@ public class InviteActivity extends PassphraseRequiredActionBarActivity implemen
     heart             = ViewUtil.findById(this, R.id.heart);
     contactsFragment  = (ContactSelectionListFragment)getSupportFragmentManager().findFragmentById(R.id.contact_selection_list_fragment);
 
-    inviteText.setText(getString(R.string.InviteActivity_lets_switch_to_signal, "https://sgnl.link/1KpeYmF"));
+    inviteText.setText(getString(R.string.InviteActivity_lets_switch_to_signal, getString(R.string.install_url)));
     updateSmsButtonText();
 
     if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {

src/org/thoughtcrime/securesms/contactshare/SharedContactDetailsActivity.java

@@ -230,7 +230,7 @@ public class SharedContactDetailsActivity extends PassphraseRequiredActionBarAct
 
       inviteButtonView.setOnClickListener(v -> {
         ContactUtil.selectRecipientThroughDialog(this, systemUsers, dynamicLanguage.getCurrentLocale(), recipient -> {
-          CommunicationActions.composeSmsThroughDefaultApp(this, recipient.getAddress(), getString(R.string.InviteActivity_lets_switch_to_signal, "https://sgnl.link/1KpeYmF"));
+          CommunicationActions.composeSmsThroughDefaultApp(this, recipient.getAddress(), getString(R.string.InviteActivity_lets_switch_to_signal, getString(R.string.install_url)));
         });
       });
     } else {

src/org/thoughtcrime/securesms/conversation/ConversationActivity.java

@@ -210,7 +210,6 @@ import org.whispersystems.libsignal.InvalidMessageException;
 import org.whispersystems.libsignal.util.guava.Optional;
 
 import java.io.IOException;
-import java.security.SecureRandom;
 import java.text.SimpleDateFormat;
 import java.util.Collections;
 import java.util.Date;
@@ -874,11 +873,7 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
   }
 
   private void handleInviteLink() {
-    String inviteText;
-
-    boolean a = new SecureRandom().nextBoolean();
-    if (a) inviteText = getString(R.string.ConversationActivity_lets_switch_to_signal, "https://sgnl.link/1LoIMUl");
-    else   inviteText = getString(R.string.ConversationActivity_lets_use_this_to_chat, "https://sgnl.link/1MF56H1");
+    String inviteText = getString(R.string.ConversationActivity_lets_switch_to_signal, getString(R.string.install_url));
 
     if (isDefaultSms) {
       composeText.appendInvite(inviteText);

src/org/thoughtcrime/securesms/conversation/ConversationFragment.java

@@ -980,7 +980,7 @@ public class ConversationFragment extends Fragment
       if (getContext() == null) return;
 
       ContactUtil.selectRecipientThroughDialog(getContext(), choices, locale, recipient -> {
-        CommunicationActions.composeSmsThroughDefaultApp(getContext(), recipient.getAddress(), getString(R.string.InviteActivity_lets_switch_to_signal, "https://sgnl.link/1KpeYmF"));
+        CommunicationActions.composeSmsThroughDefaultApp(getContext(), recipient.getAddress(), getString(R.string.InviteActivity_lets_switch_to_signal, getString(R.string.install_url)));
       });
     }
   }