[loc] update Solvene translation to v1.0.10

[iso] libcdio is temperamental when it comes to NULL pointers

* Fixes a crash when opening the latest gparted and probably other ISOs

[misc] factorize SizeToHumanReadable() and ensure log sizes are in En…

…glish

* Also use an allocated buffer for DD operations

[loc] update Russian translation to v1.0.10

[iso] fix UDF UNICODE support

* libcdio's unicode16_decode() was not decoding labels at all,
  but simply stripping the MSB of the UDF USC-16 sequences
* use an actual conversion to UTF-8
* also update the rest of udf_fs.c to latest libcdio version
* closes pbatard#285

[loc] update Chinese (Simplified) translation to v1.0.10

[loc] update Italian translation to v1.0.10

[loc] update German translation to v1.0.10

[loc] update Polish translation to v1.0.10

* Closes pbatard#284

[iso] fix a libcdio memleak for RR symlinks

* Also handle symlinks more gracefully by telling the user that they are ignored
* Also tell the user which extensions will be used on extraction