Add missing Arabic translations for 'author', 'see_also' and 'posts' (#474)

Latiif alSharif

03.35.2020 742404cbb29f6e6cd6cd0ae2d5dc7e1c46968c11

 i18n/ar.toml

@@ -21,3 +21,12 @@

[powered_by]
other = "بواسطة"

[author]
other = "الكاتب"

[see_also]
other = "انظر أيضاً"

[posts]
other = "المنشورات"