Clean up (in line with the RU version)

Mostly cosmetic changes to the document format, copied over from the recent update to its original counterpart. See PR #871 for details (in Russian).
Update README_EN.md

Minor corrections.
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BLUEFOR > BLUFOR

References:
https://community.bistudio.com/wiki/Side
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Rephrased the notice on how to pick up items safely.
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* On the radio table, switched places of AN/PRF148-JEM and AN/PRC-154 to resemble the sorting order of its RU counterpart. This way, it should be easier to cross-compare them for details when and if they are updated.

* In descriptions changed "personal" and "rifleman" to "handheld. the "P" in "AN/PRC" actually stands for "Portable" (Army/Navy, Portable, Radio, Communication). Either way, the only pertinent distinction among the listed infantry radios is that some are handheld (portable) while the others are backpack-carried (long range) or mountable. Distinguishing them by the rank/role of its intended user--squaddie v. commander radio--doesn't make much sense either, since in combat any trained soldier would use any available tool to him, regardless of his specialization or position on the team.
changed "built-in/inbuilt" to "vehicle-mounted"

See references:
http://en.wikipedia.org/wiki/Mobile_radio
lined up the Underwater transceiver with emoji
Removed the outdated comments

It stated that the list of Radios was incomplete, while in actuality it is, as those particular radios mentioned are in fact already listed.
Update README_EN.md
Merge pull request #872 from Tourorist/patch-5

Clean up (in line with the RU version)