Added experimental transliterate support

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

@@ -168,6 +168,10 @@ public class DeepL {
                 }
             });
 
+            if (BuildConfig.DEBUG && TextHelper.canTransliterate())
+                languages.add(0, new Language(context.getString(R.string.title_advanced_notify_transliterate),
+                        "transliterate", false, null, true, 0));
+
             return languages;
         } catch (Throwable ex) {
             Log.e(ex);
@@ -193,6 +197,13 @@ public class DeepL {
     }
 
     public static Translation translate(CharSequence text, boolean html, String target, boolean formality, Context context) throws IOException, JSONException {
+        if ("transliterate".equals(target)) {
+            Locale detected = TextHelper.detectLanguage(context, text.toString());
+            String transliterated = TextHelper.transliterate(context, text.toString());
+            String language = Locale.getDefault().toLanguageTag();
+            return new Translation(detected == null ? language : detected.toLanguageTag(), language, transliterated);
+        }
+
         if (!ConnectionHelper.getNetworkState(context).isConnected())
             throw new IllegalArgumentException(context.getString(R.string.title_no_internet));
 
@@ -367,6 +378,15 @@ public class DeepL {
         public String detected_language;
         public String target_language;
         public CharSequence translated_text;
+
+        Translation() {
+        }
+
+        Translation(String detected, String target, CharSequence text) {
+            this.detected_language = detected;
+            this.target_language = target;
+            this.translated_text = text;
+        }
     }
 
     public static class FragmentDialogDeepL extends FragmentDialogBase {

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

@@ -120,7 +120,7 @@ public class FragmentDialogTranslate extends FragmentDialogBase {
                         ssb.setSpan(new ForegroundColorSpan(textColorPrimary), 0, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
 
                         Locale source = Locale.forLanguageTag(translation.detected_language);
-                        Locale target = Locale.forLanguageTag(args.getString("target"));
+                        Locale target = Locale.forLanguageTag(translation.target_language);
 
                         String lang = "[" + source.getDisplayLanguage(target) + "]\n\n";
                         ssb.insert(0, lang);
@@ -292,7 +292,7 @@ public class FragmentDialogTranslate extends FragmentDialogBase {
                                 ssb.setSpan(new ForegroundColorSpan(textColorPrimary), start, end, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
 
                                 Locale source = Locale.forLanguageTag(translation.detected_language);
-                                Locale target = Locale.forLanguageTag(args.getString("target"));
+                                Locale target = Locale.forLanguageTag(translation.target_language);
 
                                 String lang = "[" + source.getDisplayLanguage(target) + "] ";
                                 ssb.insert(start, lang);