DocumentsUI: Remove catch-all statements

This removes several "catch (Exception)" statements which violates the Android code
style guidelines and hides problems.

I left some catch-all statements in, as they seem to be intended like this (grep for
"catch (Exception").

I suggest we do not merge this before we are sure that we fixed any problems. One problem
is a crash when deleting items (I'm currently working to fix that).

PS 2: Add exception to log.
Change-Id: I483c320c7ee256acd993dd2a509c031fa5e3f09e
DocumentsUI: Handle NPE gracefully

Cherry-picked from OmniROM.

http://jira.omnirom.org/browse/OMNI-956

Change-Id: I8d50d71a9c91486dfc9e5da01538c6b5a626f054
frameworks/Documents: ES translations

Change-Id: I289b56f1b9ecdfe1d37633eb64b24eea5c927d9f
Fix Icon size in DocumentsUI

For XXHDPI devices if you go into Settings/Display and Notification light and select a custom value (application) you will see a GIANT icon.

Before - http://i.imgur.com/DRkua3T.png

After - http://i.imgur.com/f7xW4tY.png

Change-Id: Ia355bddc515906134c8b3b4e67d381aaacceec78
DocumentsUI: DE-Translation (add custom strings)

Change-Id: I3f632829baf221c92322d202f81d240919fdcb28
Replaced custom strings with Android defaults

PS2: also replaced menu_cut/copy/paste with strings from android.R.string

Change-Id: I7695b283faa66c6997fad372b31de2c678d222d0