Changes
test to see how messages break if fed invalid parameters
cfg.modulePossessive = "module's" -- Possessive case for "module".
cfg.mirrorEditSummary = 'Create sandbox version of $1' -- The default edit summary to use when a user clicks the "mirror" link. $1 is a wikilink to the template page.
cfg.experimentBlurb = 'Editors can experiment in this $1 $2 and $3 5 pages.' -- Text inviting editors to experiment in sandbox and test cases pages. It is only shown in the template and module namespaces. $1 is cfg.templatePossessive or cfg.modulePossessive depending on what namespace we are in. $2 is a link to the sandbox in the format "cfg.sandboxLinkDisplay (cfg.sandboxEditLinkDisplay | cfg.compareLinkDisplay)" if the sandbox exists, and the format "cfg.sandboxLinkDisplay (cfg.sandboxCreateLinkDisplay | cfg.mirrorLinkDisplay)" if the sandbox doesn't exist. If the sandbox link doesn't exist, the create link preloads the page with cfg.templateSandboxPreload or cfg.moduleSandboxPreload depending on the current namespace. If the page doesn't exist, the mirror link uses the edit summar cfg.mirrorEditSummary. $3 is a link to the test cases page in the format "cfg.testcasesLinkDisplay (cfg.testcasesEditLinkDisplay)" if the test cases page exists, and in the format "cfg.testcasesLinkDisplay (cfg.testcasesCreateLinkDisplay)" if the test cases page doesn't exist. If the test cases page doesn't exist, the create link preloads the page with cfg.templateTestcasesPreload or cfg.moduleTestcasesPreload depending on the current namespace.
cfg.addCategoriesBlurb = 'Please add categories to the $1 subpage.' -- Text to direct users to add categories to the /doc subpage. Not used if the "content" or "docname fed" arguments are set, as then it is not clear where to add the categories. $1 is a link to the /doc subpage with a display value of cfg.docLinkDisplay.
cfg.printBlurb = 'A [[Help:Books/for experts#Improving the book layout|print version]] of this template exists at $1. If you make a change to this template, please update the print version as well.' -- Text to display if a /Print subpage exists. $1 is a link to the subpage with a display value of cfg.printLinkDisplay.