Add i18n and optimise template parsing

i18n/en.json

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+{
+  "lang": "en",
+
+  "title.today": "Your day so far",
+  "title.days": "Previous days",
+  "title.notes": "Notes",
+
+  "link.today": "today",
+  "link.days": "previous days",
+  "link.notes": "notes",
+
+  "description.notes": "/notes/<name> for a new note",
+  "misc.date": "Today is",
+  "button.save": "Save"
+}

i18n/ru.json

@@ -0,0 +1,15 @@
+{
+  "lang": "ru",
+
+  "title.today": "Сегодняшний день",
+  "title.days": "Предыдущие дни",
+  "title.notes": "Заметки",
+
+  "link.today": "сегодня",
+  "link.days": "раньше",
+  "link.notes": "заметки",
+
+  "description.notes": "/notes/<название> для новой заметки",
+  "misc.date": "Сегодня",
+  "button.save": "Сохранить"
+}