Add polish to processing lanugages

SOLR doesn't support polish out of the box. Plugins are required for
polish. The language has been added only with basic support. For
better results, a manual setup of solr is required.

Closes: #1345

modules/webapp/src/main/elm/Data/Language.elm

@@ -33,6 +33,7 @@ type Language
     | Hebrew
     | Hungarian
     | Lithuanian
+    | Polish
 
 
 fromString : String -> Maybe Language
@@ -94,6 +95,9 @@ fromString str =
     else if str == "lit" || str == "lt" || str == "lithuanian" then
         Just Lithuanian
 
+    else if str == "pol" || str == "pl" || str == "polish" then
+        Just Polish
+
     else
         Nothing
 
@@ -158,6 +162,9 @@ toIso3 lang =
         Lithuanian ->
             "lit"
 
+        Polish ->
+            "pol"
+
 
 all : List Language
 all =
@@ -180,4 +187,5 @@ all =
     , Hebrew
     , Hungarian
     , Lithuanian
+    , Polish
     ]

modules/webapp/src/main/elm/Messages/Data/Language.elm

@@ -74,6 +74,9 @@ gb lang =
         Lithuanian ->
             "Lithuanian"
 
+        Polish ->
+            "Polish"
+
 
 de : Language -> String
 de lang =
@@ -135,6 +138,9 @@ de lang =
         Lithuanian ->
             "Litauisch"
 
+        Polish ->
+            "Polnisch"
+
 
 fr : Language -> String
 fr lang =
@@ -195,3 +201,6 @@ fr lang =
 
         Lithuanian ->
             "Lituanien"
+
+        Polish ->
+            "Polonais"