i18n: improve for 'es' and add 'bg' (#58)

* Translate read_time, toc and translations to spanish

* Add translations in bulgarian

i18n/bg.yaml

@@ -0,0 +1,16 @@
+- id: prev_page
+  translation: "Предишна страница"
+
+- id: next_page
+  translation: "Следваща страница"
+
+- id: read_time
+  translation:
+    one : "1 мин"
+    other: "{{ .Count }} мин"
+
+- id: toc
+  translation: "Съдържание"
+
+- id: translations
+  translation: "Преводи"

i18n/es.yaml

@@ -3,3 +3,14 @@
 
 - id: next_page
   translation: "Página siguiente"
+
+- id: read_time
+  translation:
+    one : "1 min"
+    other: "{{ .Count }} min"
+
+- id: toc
+  translation: "Tabla de Contenidos"
+
+- id: translations
+  translation: "Traducciones"