Update/cleanup Bluetooth Codec strings in Developer Settings

Misc. fixes and cleanup related to the Bluetooth Codec strings
in Developer Settings:

 * Update the codec name "aptX-HD" -> "aptX HD" to reflect the vendor
   defined writing:
   https://www.aptx.com/aptx-hd
 * Increase some of the "CHAR LIMIT" values for the purpose
   of translation to other languages
 * Update some of the text in the UI (for clarity)
 * Added new string: "Streaming: " that is used in the UI summary

Test: UI visual observation
Bug: b/34188102 b/34206536 b/34209576 b/34210861 b/34207126 b/34211204
Bug: b/34206992 b/34210910 b/34210162 b/34205434 b/34198432 b/34186749
Bug: b/34188141 b/34188657 b/34192932 b/34188655
Change-Id: I9dc609594864b5d29394c49e0bce64416706c81c