refactor: migrate i18n files from YAML to TOML format and simplify structure (#1230)

* refactor: migrate i18n files from YAML to TOML format and simplify structure

* refactor: make translation file adjust to gohugoio/locales language code so date translation can work properly

* refactor: use hyphens instead of underscores for i18n, because that's how Hugo pick the translation file

* docs: update comments for i18n language availability and CJK language detection in hugo.toml.

i18n/bn.toml

@@ -0,0 +1,47 @@
+toggleMenu = "টগল মেনু"
+darkMode   = "ডার্ক মোড"
+
+[list]
+    section = "অনুচ্ছেদ"
+
+    [list.page]
+        one   = "{{ .Count }} পাতা"
+        other = "{{ .Count }} পাতা"
+
+    [list.subsection]
+        one   = "উপ-অনুচ্ছেদ"
+        other = "উপ-অনুচ্ছেদ"
+
+[article]
+    back            = "পেছনে"
+    tableOfContents = "সূচিপত্র"
+    relatedContent  = "সম্পর্কিত বিষয়বস্তু"
+    lastUpdatedOn   = "সর্বশেষ আপডেট করা হয়েছে"
+
+    [article.readingTime]
+        one   = "{{ .Count }} মিনিটে পড়া যাবে"
+        other = "{{ .Count }} মিনিটে পড়া যাবে"
+
+[notFound]
+    title    = "পাওয়া যায়নি"
+    subtitle = "এই পাতাটি বিদ্যমান নেই"
+
+[widget]
+    [widget.archives]
+        title = "আর্কাইভ"
+        more  = "আরও"
+
+    [widget.tagCloud]
+        title = "ট্যাগ"
+
+    [widget.categoriesCloud]
+        title = "বিভাগ"
+
+[search]
+    title       = "অনুসন্ধান"
+    placeholder = "কিছু টাইপ করুন..."
+    resultTitle = "#PAGES_COUNT পাতা (#TIME_SECONDS সেকেন্ড)"
+
+[footer]
+    builtWith  = "{{ .Generator }} দিয়ে নির্মিত"
+    designedBy = "থিম {{ .Theme }} ডিজাইন করেছেন {{ .DesignedBy }}"