Develop based on Lin and extract-localizable-string-plugin-xcode. It not only can extract localizable string but also provides auto-completion for localized key.
#Install Support Xcode 7.1 Beta
Option 1: run install_plugin.sh, and restart XCode;
Option 2: copy Lin.xcplugin to "~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/"
#Uninstall
Delete Lin.xcplugin at "~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/"
#Add
#Change
#Delete
###References: