Change semistandard to eslint

[cjiang2000]

Use ESLint with the same configuration as Semistandard version 16.0.0
Updated codebase to match new version

Fixed the following rules(automatic):

• Using const when possible
• Strings using single quotes
• Spacing tweaks
• Using dot accessors instead of bracket accessors
• Not using quotes for object properties when possible

Fixed the following rules(manual):

• Using Regex literals instead of RegExp
• Added default values for latter parameters
• Not using hasOwnProperty()
• Using forEach instead of map
• Added brackets around case declarations
• Using const when possible

J = SLAP-1343
TEST = Manual

Built a page in Japanese and opened it.

[coveralls]

Coverage decreased (-0.003%) to 56.79% when pulling 1e4f4fa on dev/semistandard into deaa78d on develop.

[cea2aj]

@oshi97 I know we have brought up just using eslint for all our repos. Does switching to that make more sense here? Otherwise I'm happy with this change

[oshi97]

@oshi97 I know we have brought up just using eslint for all our repos. Does switching to that make more sense here? Otherwise I'm happy with this change

yeah I think that makes sense, semistandard is just eslint without configurability so it shouldn't be hard to eject out of it

[cea2aj]

lgtm