Add language icon to books page
Add language icon to books page

meilalina/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,meilalina/kotlin-web-site,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,meilalina/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,meilalina/kotlin-web-site,JetBrains/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,JetBrains/kotlin-web-site