Added normalize-space to gloss value

[GusRiva]

Dealing with #717

What I did:

Found the place where the content of gloss was created and normalized the whitespace

How I tested:

• Add whitespace at the beginning or ending of a gloss in /TEI/P5/Source/Specs
• Build the guidelines (using this branch of the stylesheets) and see if the whitespaces are normalized

Example test:

Change /TEI/P5/Source/Specs/ab.xml (line 5) to:
<gloss versionDate="2005-01-14" xml:lang="en"> anonymous block </gloss>

Old output (with dev branch):

<ab> ( anonymous block ) contains any ...

New output from this branch:

<ab> (anonymous block) contains any ...

[GusRiva]

These changes required some modifications in the test files.

As you can see, now this normalizes the whitespace of gloss in all ODD transformations. I actually think this is a better output in all the places where it happens.

However, if we just want to change this in the html guidelines and not as a general rule for gloss, we need to find a different place to do the change. I think this general solution is probably better, but just in case.

[sydb]

Looks good to me.

• I examined the 1-line code change, looks good
• I spot-checked a few expected results, seemed fine
• I ran make test2P on my machine — all tests pass
• I ran make test in a Docker container on my machine — all tests pass

So I am in favor of merging this ASAR.

[sydb]

BTW, @GusRiva , in my little brain the important place to effect this change was in the RELAX NG output, where some tools just report whatever whitespace is there, thus sometimes giving ugly results.