Log Message:
tex-lipsum{,-doc}: update to 2.7

2.7
### Changed
- Rework language loading mechanism (gh/10).
### Fixed
- Hyphenation pattern setting with `polyglossia` (gh/10).

2.6
### Changed
- Minor changes to `lipsum.ins`.

2.5
### Fixed
- Language 'latin' undefined error with LuaTeX (gh/6).

### Changed
- Require `babel` for language-specific hyphenation patterns (gh/6).
- In case a language is unknown, just warn instead of an error (gh/8).
- Use `\par` by default in `par-sep` rather than `par-end` (gh/7).