Add L-M lettered article stubs from glossary

[Pennek]

Part of organization effort - #3143
I've left some glossary entries alone as they have had stubs which were more fleshed out already

Adds articles:

• Health bar (previously Life bar)
• Lead-in
• Local Song Offset
• Loved
• Marathon
• Mod for Mod
• Mod Request
• Modder

Modifies articles:

• Health

[MilkyIQ]

Will review the rest later, this is all I can do before draining my battery