Bug 7679: Display all table headers (case and accent sensitive)

Bug 7679: Display all table headers (case and accent sensitive)

It appears that we can't assume that a lowercase word is equivalent to
the same word in uppercase (or a mix of lowercase and uppercase
letters). And this is also true about accented words.
So display all values even if they differ only by case or by their
accents.
This means that:
- "foobar" and "Foobar" will be in two separate rows/columns
- "Etudiant" and "Étudiant" (french) will be in two separate
  rows/columns too

Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>