Added text

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -1269,7 +1269,7 @@ public class FragmentCompose extends FragmentBase {
 
                 @Override
                 public void onNothingSelected() {
-                    Snackbar snackbar = Snackbar.make(view, R.string.title_invalid_key, Snackbar.LENGTH_LONG);
+                    Snackbar snackbar = Snackbar.make(view, R.string.title_no_key, Snackbar.LENGTH_LONG);
                     final Intent intent = KeyChain.createInstallIntent();
                     if (intent.resolveActivity(getContext().getPackageManager()) != null)
                         snackbar.setAction(R.string.title_fix, new View.OnClickListener() {

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -3913,7 +3913,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
 
                 @Override
                 public void onNothingSelected() {
-                    Snackbar snackbar = Snackbar.make(view, R.string.title_invalid_key, Snackbar.LENGTH_LONG);
+                    Snackbar snackbar = Snackbar.make(view, R.string.title_no_key, Snackbar.LENGTH_LONG);
                     final Intent intent = KeyChain.createInstallIntent();
                     if (intent.resolveActivity(getContext().getPackageManager()) != null)
                         snackbar.setAction(R.string.title_fix, new View.OnClickListener() {

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

@@ -679,6 +679,7 @@
     <string name="title_edit_formatted_text">Edit as reformatted text</string>
     <string name="title_select_certificate">Select public key</string>
     <string name="title_certificate_missing">No public key for %1$s</string>
+    <string name="title_no_key">No private key</string>
     <string name="title_invalid_key">Invalid private key</string>
     <string name="title_send_plain_text">Plain text only</string>
     <string name="title_send_receipt">Request delivery/read receipt</string>