Settings: PL Translations, fixes and improvements.

Small fixes.

Change-Id: I1fc4f26334e89578b1ed6bbb9d61accf4e9bb15e
Settings: updated it translation

Change-Id: I4051a10c56ca25ea1749ca60231e100405f77f3a
Settings: Volume panel background color && transparency [1/2]

Allow user to specify background color and transparency level
    for volume panel.

PS: make "TRDS default" summary value a resource so
        it can be translated.

Change-Id: Ic788b4ccf1826075a600e53bc6a7c3c8bda50685
Merge "Settings: updated it translation" into kk4.4
Settings: Spanish strings for volume panel color

Change-Id: Icbc5ca8eed7f682610a60533d2f75574793fd154
Settings: translation - RU

Ic788b4ccf1826075a600e53bc6a7c3c8bda50685 and other missing lines

Change-Id: Ieed66c2b602beb3e9e82fef1232b03c2d4a7407c
Merge "Settings: translation - RU" into kk4.4
Merge remote-tracking branch 'Slim/kk4.4' into kk4.4

Conflicts:
	res/values-pl/slim_strings.xml