KBackup fixes [attached] and report

[Antoni Bella Pérez]

  Hi,

  A file attached for documentation typos and small improvements.

  Here I report some GUI and console things:

-- I18N_ARGUMENT_MISSING. GUI output:
	...finished slice /home/usuari/
backup_2018.01.10-13.17.35_1.tar(I18N_ARGUMENT_MISSING)
	-- Filtered Files: 0(I18N_ARGUMENT_MISSING)

-- Console output  is translated? Yes or no.

English:
	"0 instead of 1 arguments to message {...finished slice %1} supplied 
before conversion." 

Catalan:
	"0 instead of 1 arguments to message {...s'ha finalitzat l...} supplied 
before conversion." 

  Regards
  Toni
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