Improve Ukrainian support and minor fixes in CZ, KZ, LT, LV, PL, RU, SR languages (#400)

* Fix English char 'i' in Ukrainian words

* Fix the feminine currency processing for UAH in lang_UK.py

* Fix test_ua.py

* Fix the feminine currency processing for UAH in lang_RU.py

* Add tests for UAH in test_ru.py

* Add world currencies to lang_UK.py; Add test cases to test_uk.py for world currencies

* Fix incorrect handling of zeros after decimal point for CZ, KZ, LT, LV, PL, RU, SR and UK languages

* Add ukrainian ordinal numbers

* Fix too long lines of code

* Add test for negative cardinal number

tests/test_lv.py

@@ -63,6 +63,14 @@ class Num2WordsLVTest(TestCase):
             num2words(-5000.22, lang='lv'),
             'mīnus pieci tūkstoši komats divdesmit divi',
         )
+        self.assertEqual(
+            num2words(10.02, lang='lv'),
+            "desmit komats nulle divi"
+        )
+        self.assertEqual(
+            num2words(15.007, lang='lv'),
+            "piecpadsmit komats nulle nulle septiņi"
+        )
 
         self.assertEqual(num2words(0, lang='lv'), 'nulle')
         self.assertEqual(num2words(5, lang='lv'), "pieci")