This page describes a script using the Regex menu framework to comprehensively standardize, normalize, and update any page on Wikisource. The code can be obtained from User:Pathoschild/monobook.js; note that this is highly experimental and very likely to have glitches.
Templates: remove msg: and template modifiers, and remove parameter whitespace.
Headers: normalize whitespace (no space between syntax and header text; no blank lines between header and following text; one blank line above header, unless it follows another header).
Lists: normalize whitespace (one space between item syntax and text).
Categories: normalize capitalization and parameter whitespace.
Links: normalize pipe whitespace, remove redundant link text ([[foo|foo]] to [[foo]], replace underscores with spaces.
Sorting
Group license templates, categories, and interlanguage links at the bottom of the page in separate lists by type delineated by a single blank line between each.
When no date categories are present and a full date is given in the deprecated {{author}} 'date' parameter, the script mistakenly uses the first number instead of the year for the birthyear (ie, "June 18, 1986").
Causes: regex pattern matches the first number; difficult to resolve, may need to get all numbers and use the biggest (will work in most cases).