Add spanish as an example

Adding a new language without nlp requires now only to fill out the
pieces:

- define a list of month names to support date recognition
- add it to joex' dockerfile to be available for tesseract
- update the solr migration/field definitions
- update the elm file so it shows up on the client

modules/analysis/src/main/scala/docspell/analysis/date/DateFind.scala

@@ -65,6 +65,7 @@ object DateFind {
         case Language.German  => p1.or(p0).or(p2)
         case Language.French  => p1.or(p0).or(p2)
         case Language.Italian => p1.or(p0).or(p2)
+        case Language.Spanish => p1.or(p0).or(p2)
       }
       p.read(parts) match {
         case Result.Success(sds, _) =>

modules/analysis/src/main/scala/docspell/analysis/date/MonthName.scala

@@ -22,6 +22,8 @@ object MonthName {
         french
       case Language.Italian =>
         italian
+      case Language.Spanish =>
+        spanish
     }
 
   private val numbers = List(
@@ -98,4 +100,19 @@ object MonthName {
     List("nov", "novembre"),
     List("dic", "dicembre")
   )
+
+  private val spanish = List(
+    List("ene", "enero"),
+    List("feb", "febrero"),
+    List("mar", "marzo"),
+    List("abr", "abril"),
+    List("may", "mayo"),
+    List("jun"),
+    List("jul"),
+    List("ago", "agosto"),
+    List("sep", "septiembre"),
+    List("oct", "octubre"),
+    List("nov", "noviembre"),
+    List("dic", "diciembre")
+  )
 }