* Update en_US.json
### Description:
A rough modification of en-US i18n file.
### Changes:
+ Many translation phrases have been replaced with rather native expressions.
+ Majority of translation phrases have been re-formatted for more efficient reading.
### Problems:
+ There's no standard for i18n. E.g, and my proposal:
+ All Input Prompts ends with colon(":").
+ All progress indication(e.g. "step1:processing data","step2a: ...") stays lowercase, may add CSI SGR escape sequences for highlighting.
+ List of Selections and their descriptions be written in key-value pairs.
+ No more plain-translations.
* Update en_US.json
1.Strings that refer to specific paths/locations have been quoted with '' pairs.
2.1 Typo fixed.
* Update en_US.json
1.Minor re-format.
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