Find translation results with case-insensitive comparison

lib/bing_translator.rb

@@ -161,9 +161,10 @@ def translation_request(texts, params)
 
     data = texts.map { |text| { 'Text' => text } }.to_json
     response_json = api_client.post('/translate', params: params, data: data)
+    to_lang = params[:to].to_s
     response_json.map do |translation|
       # There should be just one translation, but who knows...
-      translation['translations'].find { |result| result['to'] == params[:to].to_s }
+      translation['translations'].find { |result| result['to'].casecmp(to_lang).zero? }
     end
   end
 end

spec/bing_translator_spec.rb

@@ -31,6 +31,11 @@ def load_file(filename)
       expect(result).to eq 'Diese Nachricht sollte übersetzt werden'
     end
 
+    it 'translates text to complex language code' do
+      result = translator.translate message_en, from: :en, to: :'fr-ca'
+      expect(result).to eq 'Ce message doit être traduit'
+    end
+
     it 'translates long texts (up to allowed limit)' do
       result = translator.translate long_text, from: :en, to: :ru
       expect(result.size).to be > 1000