add support for product-specific strings
renaming previously proposed 'strings2.js' to 'strings-app.js'.  Also, fixing JSHint error -- unnecessary, trailing comma in 'strings-app.js'definition.
Merge remote-tracking branch 'origin/master' into bchin/product-specific-strings-support
Merge remote-tracking branch 'origin/master' into bchin/product-specific-strings-support
removing unnecessary non-root language definitions of 'strings-app.js'
updated strings-app.js index to reflect only 'root' location
fixed trailing comma build issue
fix indentation
Merge pull request #3743 from adobe/bchin/product-specific-strings-support

add support for product-specific strings