Move "Customizing generated text" to Globalizing
Move "Customizing generated text" to Globalizing

Per https://github.com/dita-ot/docs/pull/162#issuecomment-337708181

Signed-off-by: Roger Sheen <a61a1add71dadc74037ae5e44ee30713db9a7451@infotexture.net>

infotexture/docs,infotexture/docs,dita-ot/docs