Disallow translating as decade before 1000 CE

src/NodaTimeAutotranslater.php

@@ -338,7 +338,7 @@ final class NodaTimeAutotranslater {
             return self::TRANSLATABLE_CENTURY;
         }
 
-        if ((intval($zeit_ende) + 1) % 10 === 0 and intval($zeit_beginn) % 10 === 0) {
+        if ((intval($zeit_ende) + 1) % 10 === 0 and intval($zeit_beginn) % 10 === 0 and intval($zeit_beginn) > 1000) {
             return self::TRANSLATABLE_DECADE;
         }