Add L-M lettered article stubs from glossary

wiki/Beatmapping/Health/en.md

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 # Health
 
-**Health**, or *HP*, is the value that determines if a player has passed or failed a [beatmap](/wiki/Beatmaps). Health can be seen in the health bar,<!-- TODO: link --> which updates as gameplay progresses. The [HP drain rate](/wiki/Beatmapping/HP_drain_rate) difficulty setting determines how difficult it is to keep a high health value.
+**Health** or *HP*, is the value that determines if a player has passed or failed a [beatmap](/wiki/Beatmaps). Health can be seen in the [health bar](/wiki/Glossary/Health_Bar/en.md), which updates as gameplay progresses. The [HP drain rate](/wiki/Beatmapping/HP_drain_rate) difficulty setting determines how difficult it is to keep a high health value.
 
 ## osu!standard
 

wiki/Beatmaps/Marathon/en.md

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+# Marathon
+
+**Marathon** [beatmaps](/wiki/Beatmaps) are beatmaps which are 5 minutes or longer. They are often collaborative efforts, as mapping longer songs can be tiring when done alone.
+
+## History
+
+When marathon beatmaps were first introduced they had to be at least 6 minutes long and could only include a single difficulty (with one exception; each beatmapset could include a single [osu!taiko](/wiki/Game_Modes/osu!taiko) difficulty as well).
+
+They also had to be named "Marathon" to bypass the Beatmap Submission System at the time and prevent the beatmapset from entering the Pending category. Upon ranking, marathon beatmaps would enter the Approved category instead of the Ranked category to signal that these were marathon maps. This category was later abandoned in favor of the Ranked category.
+
+Marathon maps were later changed to include maps with 5 minute drain times and allowing custom difficulty naming. This lasted up until the more lenient spread rules were introduced in 2019.
+
+<!-- TODO: Add links and stuff -->
+
+<!-- this is a stub -->

wiki/Glossary/Health_Bar/en.md

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+---
+tags:
+  - life
+  - life bar
+  - hp bar
+---
+
+# Health bar
+
+*For Health as a mechanic, see: [Health](/wiki/Beatmapping/Health/en.md)*
+
+The **health bar** (also known as the *HP bar*) is a bar which displays a player's remaining [health](/wiki/Beatmapping/Health/en.md). In all [game modes](/wiki/Game_Modes/) expect for [osu!mania](/wiki/Game_Modes/osu!mania), there is an indicator moving along it, showing a player's current health. If the bar drains completely the player fails the current [beatmap](/wiki/Beatmaps/) (assuming no special game modifiers are enabled).
+
+In [osu!standard](/wiki/Game_Modes/osu!), [osu!catch](/wiki/Game_Modes/osu!catch), and [osu!taiko](/wiki/Game_Modes/osu!taiko) the health bar is displayed in the top-left corner of the screen. In osu!mania it is rotated 90 degrees,counterclockwise and is placed to the right of the playfield.
+
+In osu!standard and osu!catch, the healthbar will drain at a constant rate throughout the course of a beatmap, with the exception of breaks. This effect is known as [health drain](/wiki/Beatmapping/Health_drain/).
+
+<!-- TODO: Add links and stuff -->
+
+<!-- this is a stub -->

wiki/Glossary/Lead-in/en.md

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+---
+tags:
+  - leadin
+---
+
+# Lead-in
+
+The **lead-in** is a 3 second period of silence which is occasionally inserted at the beginning of a [beatmap](/wiki/Beatmaps/). This is done to give players time to react to incoming [hit objects](/wiki/Hit_object) if a mapper has placed them close to the start of the song.
+
+<!-- TODO: Add links and stuff -->
+
+<!-- this is a stub -->

wiki/Glossary/Local_Song_Offset/en.md

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+# Local Song Offset
+
+*For offset while beatmapping, see: [Offset](/wiki/Beatmapping/Offset/)*
+
+**Local song offset** is an offset which moves the appearance of [hit objects](/wiki/Hit_object/) in relation to the audio of individual [beatmaps](/wiki/beatmaps). This can be helpful for players who experience auditory or visual delays. Local song offset works alongside the global offset to calculate a total offset.
+
+At the start of gameplay, the local song offset can be changed by pressing:
+
+- `+` to increase the offset by 5 milliseconds
+- `-` to decrease the offset by 5 milliseconds
+- `Alt` + `+` to increase the offset by 1 milliseconds
+- `Alt` + `-` to decrease the offset by 1 milliseconds
+
+If a local offset is defined, osu! will display the local offset in the interface above the scoreboard. osu! will also notify you of the local offset before starting gameplay.
+
+<!-- TODO: Add links and stuff -->
+
+<!-- this is a stub -->

wiki/Glossary/Loved/en.md

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+---
+tags:
+  - heart
+---
+
+# Loved
+
+**Loved** is a state given to [beatmaps](/wiki/Beatmaps/) that don't follow the [ranking criteria](/wiki/Ranking_Criteria), but are considered popular enough to deserve their own leaderboards. Loved beatmaps contribute to a user's total playcount, but does not contribute to their [performance points](/wiki/Performance_Points). All scores on a Loved beatmap will be deleted if it moves out of the Loved category (this usually only happens on the creator's request).
+
+Loved beatmaps use the heart icon ![](/wiki/shared/status/loved.png) in the song selection screen, and are regularly added through [Project Loved](/wiki/Project_Loved/) which is handled by the [Project Loved Team](/wiki/People/The_Team/Project_Loved_Team/en.md).
+
+<!-- TODO: Add links and stuff -->
+
+<!-- this is a stub -->

wiki/Modding/Mod_For_Mod/en.md

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+---
+tags:
+  - m4m
+---
+
+# Mod for mod
+
+**Mod for mod** (also known as *M4M*) is a term that describes a trade between multiple users. It requires each user to [mod](/wiki/Modding/) the other's [beatmap](/wiki/Beatmaps).
+
+This term is usually found on the [forums](https://osu.ppy.sh/community/forums/60) where users review each other's maps, but may also be found on user profiles and external sites.
+
+Mod for mods have historically been favoured over regular mods since both parties benefit from this deal, though have become less common in recent years.
+
+<!-- TODO: Add links and stuff -->
+
+<!-- this is a stub -->

wiki/Modding/Mod_Request/en.md

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+# Mod Request
+
+A **mod request** is a term used when a beatmapper is in need of help and wants to improve their [beatmap](/wiki/Beatmaps/). This can be done in a multitude of ways but is most commonly done by requesting a normal mod or [mod for mod](/wiki/Modding/Mod_For_Mod/) in one of the [forum modding queues](https://osu.ppy.sh/community/forums/60). Once the mod request has been accepted the [modding](/wiki/Modding/) process starts and the beatmap will be checked for potential mistakes and improvements.
+
+<!-- TODO: Add links and stuff -->
+
+<!-- this is a stub -->

wiki/Modding/Modder/en.md

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+# Modder
+
+A **modder** is a user who helps other users improve their [beatmaps](/wiki/) through [modding](/wiki/Modding/). Successful posts on a beatmap discussion awards the modder Kudosu! which can be seen on the user's profile page.
+
+<!-- TODO: Add links and stuff -->
+
+<!-- this is a stub -->