theme: update and upgrade to Academic v4 dev

config/_default/languages.toml

@@ -0,0 +1,18 @@
+# Languages
+#   Create a `[X]` block for each language you want, where X is the language ID.
+#   Refer to https://sourcethemes.com/academic/docs/language/
+
+# Configure the English version of the site.
+[en]
+  languageCode = "en-us"
+
+# Uncomment the lines below to configure your website in a second language.
+#[zh]
+#  languageCode = "zh-Hans"
+#  title = "Chinese website title..."
+#  [languages.zh.params]
+#    description = "Site description in Chinese..."
+#  [[languages.zh.menu.main]]
+#    name = "Wo"
+#    url = "#about"
+#    weight = 1