VIVO-125 Create more "Google Spanish" labels

Add more labels by changing the filter in the label_stripper/label_inserter scripts. Improve the structure of the scripts to use an external filter.

utilities/languageSupport/translateLabelsInOntology/label_common.rb

@@ -11,6 +11,9 @@ require 'rdf/ntriples'
 require 'rdf/n3'
 
 include RDF
+
+class UsageError < StandardError; end
+class FilterError < StandardError; end
     
 class LabelCommon
   # ------------------------------------------------------------------------------------
@@ -21,6 +24,13 @@ class LabelCommon
   public
   # ------------------------------------------------------------------------------------
 
+  def self.load_filter(filter_file)
+    return lambda{|s| true} unless filter_file
+    return eval(IO.read(filter_file))
+  rescue
+    raise FilterError.new($!.message)
+  end
+  
   def initialize(rdf_file, &filter)
     @filter = filter.nil? ? lambda{true} : filter
     @graph = Graph.load(rdf_file)