Fix "ago" Greek translation and month typo (#1184)

Author: pothitos

arrow/locales.py

@@ -654,7 +654,7 @@ class FrenchCanadianLocale(FrenchBaseLocale, Locale):
 class GreekLocale(Locale):
     names = ["el", "el-gr"]
 
-    past = "{0} πριν"
+    past = "πριν από {0}"
     future = "σε {0}"
     and_word = "και"
 
@@ -697,7 +697,7 @@ class GreekLocale(Locale):
         "Φεβ",
         "Μαρ",
         "Απρ",
-        "Μαϊ",
+        "Μαΐ",
         "Ιον",
         "Ιολ",
         "Αυγ",

tests/test_locales.py

@@ -3178,3 +3178,14 @@ def test_plurals_mk(self):
         assert self.locale._format_timeframe("months", 11) == "11 oy"
         assert self.locale._format_timeframe("year", 1) == "bir yil"
         assert self.locale._format_timeframe("years", 12) == "12 yil"
+
+
+@pytest.mark.usefixtures("lang_locale")
+class TestGreekLocale:
+    def test_format_relative_future(self):
+        result = self.locale._format_relative("μία ώρα", "ώρα", -1)
+
+        assert result == "πριν από μία ώρα"  # an hour ago
+
+    def test_month_abbreviation(self):
+        assert self.locale.month_abbreviations[5] == "Μαΐ"