Localize warning message

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

@@ -1242,7 +1242,7 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
 
                                 // Write decrypted body
                                 EntityMessage m = db.message().getMessage(id);
-                                m.write(context, parts.getHtml());
+                                m.write(context, parts.getHtml(context));
 
                                 // Remove previously decrypted attachments
                                 for (EntityAttachment a : attachments)

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

@@ -537,7 +537,7 @@ public class MessageHelper {
         private List<AttachmentPart> attachments = new ArrayList<>();
         private List<String> warnings = new ArrayList<>();
 
-        String getHtml() throws MessagingException {
+        String getHtml(Context context) throws MessagingException {
             if (plain == null && html == null)
                 return null;
 
@@ -562,12 +562,10 @@ public class MessageHelper {
 
             ContentType ct = new ContentType(part.getContentType());
             String charset = ct.getParameter("charset");
-            if (TextUtils.isEmpty(charset))
+            if (!TextUtils.isEmpty(charset)) {
-                warnings.add("Missing charset");
-            else {
                 if ("US-ASCII".equals(Charset.forName(charset).name()) &&
                         !"US-ASCII".equals(charset.toUpperCase()))
-                    warnings.add("Unknown charset " + charset);
+                    warnings.add(context.getString(R.string.title_no_charset, charset));
             }
 
             if (part.isMimeType("text/plain") || text)

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

@@ -1963,7 +1963,7 @@ public class ServiceSynchronize extends LifecycleService {
 
         MessageHelper helper = new MessageHelper((MimeMessage) imessage);
         MessageHelper.MessageParts parts = helper.getMessageParts();
-        String body = parts.getHtml();
+        String body = parts.getHtml(this);
         String preview = HtmlHelper.getPreview(body);
         message.write(this, body);
         db.message().setMessageContent(message.id, true, preview);
@@ -2625,7 +2625,7 @@ public class ServiceSynchronize extends LifecycleService {
 
             if (!message.content)
                 if (!metered || (message.size != null && message.size < maxSize)) {
-                    String body = parts.getHtml();
+                    String body = parts.getHtml(context);
                     message.write(context, body);
                     db.message().setMessageContent(message.id, true, HtmlHelper.getPreview(body));
                     String warnings = parts.getWarnings();

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

@@ -439,6 +439,7 @@
     <string name="title_report">Report</string>
     <string name="title_no_ask_again">Do not ask this again</string>
     <string name="title_no_adobe">Adobe Acrobat reader cannot open safely shared files, see the FAQ for more information</string>
+    <string name="title_no_charset">Unsupported encoding: %1$s</string>
 
     <string name="title_try">Try FairEmail, an open source, privacy friendly email app for Android</string>