Ticket 1718 - Fix Spanish po translation file

There were quite errors in es.po, it was difficult or impossible to
track down where they came from, Transifex does not have good revision
history.

I fixed about 20% of the msgstr's in the file that had obvious
problems which could be spotted by a non-Spanish speaking person.

Spurious backslashes and backslash-newlines had been introduced. I
tracked this particular problem down to a bug in polib. polib is a
Python library which can read/write po/mo files. In Fedora it's
packaged as python-polib. polib is used by the Transifex instance to
read/write po files. We don't currently use polib in IPA (that will
change soon though) but I wrote utilities using polib to help fix the
bad po file and analyze what had gone wrong. I discovered that if one
simply uses polib to read a po file into memory and they write that po
file back out from memory you don't end up with the same contents if
there are backslashed escapes in the file. I tracked this down to the
escape() and unescape() functions in polib. This caused me to look to
see if upstream polib had been fixed. It had. Therefore I think the
spurious backslashes were introduced when Transifex was using an older
broken version of polib. I filed this Fedora bug
https://bugzilla.redhat.com/show_bug.cgi?id=744419 to get the fixes
into python-polib. I manually corrected all the backslash errors.

I compared all 1329 translations from a known good version of es.po
with the current version and generated a new es.po by taking the
translation (e.g. msgstr) from the two po files which was obviously
correct. In those instances where neither msgstr was obviosuly correct
the deleted the translation entirely.

I also wrote utilities to validate any "substitution" variables
appearing in the text. I discovered a number of instances where the
substitution variable had been malformed by the translator such that
it was syntactically invalid. This is how we originally discovered
problems with the translation, it was throwing Python exceptions. I
fixed all those errors.

I also found approximately 80 translations where the leading
whitespace had been altered by the translator. Those also were fixed.

I cannot verify that the remaining translations are a correct Spanish
translation of the original text (in fact a number of them I looked at
seemed dubious to me, for example it omitted recongnizable
keywords). But I do believe that the obvious errors are fixed and we
shouldn't be throwing any more Python exceptions because of malformed
substitution variables.

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