Add i18n for arabic (#336)

* Add Arabic i18n file.

Signed-off-by: latiif <latiif@mail.com>

* Add Latiif Alsharif to contributors

Signed-off-by: latiif <latiif@mail.com>

CONTRIBUTORS.md

@@ -66,3 +66,4 @@
 - [Clément Pannetier](https://clementpannetier.dev)
 - [FantasticMao](https://github.com/FantasticMao)
 - [Utkarsh Gupta](https://utkarsh2102.com)
+- [Latiif Alsharif](https://latiif.se)

i18n/ar.toml

@@ -0,0 +1,23 @@
+[category]
+other = "فئة"
+
+[tag]
+other = "وَسم"
+
+[series]
+other = "سلسلة"
+
+[reading_time]
+other = "تستغرق {{ .Count }} د"
+
+[page_not_found]
+other = "الصفحة غير موجودة"
+
+[page_does_not_exist]
+other = "هذه الصفحة غير موجودة"
+
+[head_back]
+other = "بإمكانك العودة إلى <a href=\"{{ . }}\">homepage</a>."
+
+[powered_by]
+other = "بواسطة"