Create MO parser

Refactored a bit too, so we can use interfaces to take Mo and Po files

added fixtures

found that the parser for Po files have a bug... but it works... so not touched

translation.go

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2018 DeineAgentur UG https://www.deineagentur.com. All rights reserved.
+ * Licensed under the MIT License. See LICENSE file in the project root for full license information.
+ */
+
+package gotext
+
+type Translation struct {
+	ID       string
+	PluralID string
+	Trs      map[int]string
+}
+
+func NewTranslation() *Translation {
+	tr := new(Translation)
+	tr.Trs = make(map[int]string)
+
+	return tr
+}
+
+func (t *Translation) Get() string {
+	// Look for Translation index 0
+	if _, ok := t.Trs[0]; ok {
+		if t.Trs[0] != "" {
+			return t.Trs[0]
+		}
+	}
+
+	// Return untranslated id by default
+	return t.ID
+}
+
+func (t *Translation) GetN(n int) string {
+	// Look for Translation index
+	if _, ok := t.Trs[n]; ok {
+		if t.Trs[n] != "" {
+			return t.Trs[n]
+		}
+	}
+
+	// Return untranslated singular if corresponding
+	if n == 0 {
+		return t.ID
+	}
+
+	// Return untranslated plural by default
+	return t.PluralID
+}