Improved DeepL current language selection

FAQ.md

@@ -3708,11 +3708,13 @@ Unfortunately, it is not possible to hide messages on the email server too.
 <a name="faq167"></a>
 **(167) How can I use DeepL?**
 
+1. Check if [DeepL](https://www.deepl.com/) supports your language
 1. Enable DeepL support in the miscellaneous settings
 1. [Subscribe to](https://www.deepl.com/pro#developer) the DeepL API Free or Pro plan (credit card required)
 1. [Copy](https://www.deepl.com/pro-account/plan) the authentication key
 1. In the message composer tap on the faint translate button (文A), select *Configure* and paste the key
 
+
 You might want to read the [privacy policy](https://www.deepl.com/privacy/) of DeepL.
 
 This feature requires an internet connection and is not available in the Play store version.

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

@@ -140,11 +140,25 @@ public class DeepL {
             ensureLanguages(context);
 
             Locale locale = Locale.getDefault();
+            String tag = locale.toLanguageTag(); // en-US
+            String lang = locale.getLanguage(); // en
+
+            if ("en".equalsIgnoreCase(lang))
+                if ("EN-GB".equalsIgnoreCase(tag) || "EN-US".equalsIgnoreCase(tag))
+                    lang = tag;
+                else
+                    lang = "EN-US";
+
+            if ("pt".equalsIgnoreCase(lang))
+                if ("PT-BR".equalsIgnoreCase(tag) || "PT-PT".equalsIgnoreCase(tag))
+                    lang = tag;
+                else
+                    lang = "PT-PT";
+
             for (int i = 0; i < jlanguages.length(); i++) {
                 JSONObject jlanguage = jlanguages.getJSONObject(i);
                 String language = jlanguage.getString("language");
-                if (language.equalsIgnoreCase(locale.toLanguageTag()) ||
-                        language.equalsIgnoreCase(locale.getLanguage())) {
+                if (language.equalsIgnoreCase(lang)) {
                     return language;
                 }
             }