Updated Spanish translation
script-fu: Bug #679215: Fixed potential buffer overflow in readstr_upto()

Cherry picked from commit 76155d79df8d497d9a5994029247387e222da9e9.

gimp-2-6 is no longer maintained. But we might as well commit this for
the benefit of EL/LTS distros. This patch hasn't even been compiled, so
YMMV. Enjoy.
Updated Greek translations
file-cel: check fread()/g_fopen() return values and pass on errors
(cherry picked from commit 797db58b94c64f418c35d38b7a608d933c8cebef)
file-cel: validate header data (CVE-2012-3403)
(cherry picked from commit b772d1b84c9272bb46ab9a21db4390e6263c9892)
file-cel: use statically allocated palette buffer
(cherry picked from commit 69b98191cf315bcf0f7b8878896c01600e67c124)
file-cel: use g_set_error() for errors instead of g_message()
(cherry picked from commit 86f4cd39bd493c88a7a19b56d1827d8b911e07f6)

Conflicts:
    plug-ins/common/file-cel.c
file-cel: close file on error
file-gif-load: limit len and height (CVE-2012-3481)

Ensure values of len and height can't overflow g_malloc() argument type.
(cherry picked from commit d95c2f0bcb6775bdee2bef35b7d84f6dfd490783)
file-gif-load: fix type overflow (CVE-2012-3481)

Cast variables properly to avoid overflowing when computing how much
memory to allocate.
(cherry picked from commit 43fc9dbd8e2196944c8a71321e525b89b7df9f5c)
Bug 676804 - file handling DoS for fit file format

Apply patch from joe@reactionis.co.uk which fixes a buffer overflow on
broken/malicious fits files.
(cherry picked from commit ace45631595e8781a1420842582d67160097163c)
Updated POTFILES.in
file-cel: make generating thumbnails more robust

Ran non-interactively, file-cel could crash e.g. if loading an image to
generate a thumbnail, because there is no way to specify a palette file
in that case.
(cherry picked from commit 96ce2c936dd2fb8cfbfcbadf95d667b7d6d47ca2)
file-xwd: Delete dead variable and assignment
(cherry picked from commit f3d6e1ce8c547deed4fca412c96a8421e153b697)
Bug 687392 - Memory corruption vulnerability when reading XWD files

Applied and enhanced patch from andres which makes file-xwd detect
this kind of file corruption and abort loading with an error message.
(cherry picked from commit 0b35f6a082a0b3c372c568ea6bde39a4796acde2)