arg-or-separator - remove whitespace

Steve,

I really think the default value of arg-or-separator should not include
any leading or trailing space. e.g., for text/en.xml, it should just be:

  <dl:text key="arg-or-separator">|</dl:text>

Including space around that OR separator can cause lines to break within
DocBook <group>s, which I think is not what most users would expect.

For example, if I want to render a synopsis like this:

  imdirsync [-host <hostName>] [-con <N>]  [-run <dump|part|build|inst>]

..if I keep arg-or-separator set to the default " | " value, I get:

  imdirsync [-host <hostName>] [-con <N>] [-run <dump | part | build |
  inst>] 

That is, the group gets broken across a line -- definely not what I want
or expect.

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