Tidy generation, encoding of README files

Encoding issues are now taken care of by html-to-text.
No longer are there "ASCII" hacks in stylesheets and
such.

Some READMEs were available but not installed.  Even
though some of these are older translations they are
now all installed to the system.

* doc/aptitude-txt.xsl:
  - removed ASCII hacks which did not work
* doc/fixup-text:
  - removed this script, no longer needed
* doc/html-to-text:
  - now takes mandatory output encoding argument
* explicitly set encodings
  - README.en → ISO-8859-1
  - README.{cs,es,fr,fi,it,ja} → UTF-8
* po/*.po:
  - updated for these changes
  - clear incorrect msgstr where the translator
    had mistaken the purpose of "README"

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