Minimum 7 words for language detection

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

@@ -60,7 +60,7 @@ import javax.xml.transform.stream.StreamResult;
 import javax.xml.transform.stream.StreamSource;
 
 public class TextHelper {
-    private static final int MIN_WORDS = 10;
+    private static final int MIN_WORDS = 7;
     private static final int MAX_DETECT_SAMPLE_SIZE = 8192;
     private static final float MIN_DETECT_PROBABILITY = 0.80f;
     private static final String TRANSLITERATOR = "Any-Latin; Latin-ASCII";