Add standard definitions for ALGR and KC_ALGR (#4389)

* Add standard ALGR defition, remove (re)definitions from language files

* Use ALGR(kc) consistently in ALTGR(kc) aliases

* Non-Nordic keymaps should not use NO_ALGR

* Add standard KC_ALGR definition

* Update docs with ALGR and KC_ALGR

* Update SS_ALGR and ALGR_T aliases

3 files changed, 5 insertions, 5 deletions

diff --git a/docs/feature_advanced_keycodes.md b/docs/feature_advanced_keycodes.md
index bb5cb7419..e5f241f7f 100644
--- a/docs/feature_advanced_keycodes.md
+++ b/docs/feature_advanced_keycodes.md
@@ -68,7 +68,7 @@ These allow you to combine a modifier with a keycode. When pressed, the keydown
 |`LGUI(kc)`|`LCMD(kc)`, `LWIN(kc)`|Hold Left GUI and press `kc`                        |
 |`RCTL(kc)`|                      |Hold Right Control and press `kc`                   |
 |`RSFT(kc)`|                      |Hold Right Shift and press `kc`                     |
-|`RALT(kc)`|                      |Hold Right Alt and press `kc`                       |
+|`RALT(kc)`|`ALGR(kc)`            |Hold Right Alt and press `kc`                       |
 |`RGUI(kc)`|`RCMD(kc)`, `LWIN(kc)`|Hold Right GUI and press `kc`                       |
 |`HYPR(kc)`|                      |Hold Left Control, Shift, Alt and GUI and press `kc`|
 |`MEH(kc)` |                      |Hold Left Control, Shift and Alt and press `kc`     |
@@ -92,7 +92,7 @@ The modifiers this keycode and `OSM()` accept are prefixed with `MOD_`, not `KC_
 |`MOD_LGUI`|Left GUI (Windows/Command/Meta key)     |
 |`MOD_RCTL`|Right Control                           |
 |`MOD_RSFT`|Right Shift                             |
-|`MOD_RALT`|Right Alt                               |
+|`MOD_RALT`|Right Alt (AltGr)                       |
 |`MOD_RGUI`|Right GUI (Windows/Command/Meta key)    |
 |`MOD_HYPR`|Hyper (Left Control, Shift, Alt and GUI)|
 |`MOD_MEH` |Meh (Left Control, Shift, and Alt)      |
diff --git a/docs/keycodes.md b/docs/keycodes.md
index 75b01389c..d12a85aa1 100644
--- a/docs/keycodes.md
+++ b/docs/keycodes.md
@@ -177,7 +177,7 @@ This is a reference only. Each group of keys links to the page documenting their
 |`KC_LGUI`              |`KC_LCMD`, `KC_LWIN`|Left GUI (Windows/Command/Meta key)            |
 |`KC_RCTRL`             |`KC_RCTL`           |Right Control                                  |
 |`KC_RSHIFT`            |`KC_RSFT`           |Right Shift                                    |
-|`KC_RALT`              |                    |Right Alt                                      |
+|`KC_RALT`              |`KC_ALGR`           |Right Alt (AltGr)                              |
 |`KC_RGUI`              |`KC_RCMD`, `KC_RWIN`|Right GUI (Windows/Command/Meta key)           |
 |`KC_SYSTEM_POWER`      |`KC_PWR`            |System Power Down                              |
 |`KC_SYSTEM_SLEEP`      |`KC_SLEP`           |System Sleep                                   |
@@ -331,7 +331,7 @@ This is a reference only. Each group of keys links to the page documenting their
 |`LGUI(kc)`|`LCMD(kc)`, `LWIN(kc)`|Hold Left GUI and press `kc`                        |
 |`RCTL(kc)`|                      |Hold Right Control and press `kc`                   |
 |`RSFT(kc)`|                      |Hold Right Shift and press `kc`                     |
-|`RALT(kc)`|                      |Hold Right Alt and press `kc`                       |
+|`RALT(kc)`|`ALGR(kc)`            |Hold Right Alt and press `kc`                       |
 |`RGUI(kc)`|`RCMD(kc)`, `LWIN(kc)`|Hold Right GUI and press `kc`                       |
 |`HYPR(kc)`|                      |Hold Left Control, Shift, Alt and GUI and press `kc`|
 |`MEH(kc)` |                      |Hold Left Control, Shift and Alt and press `kc`     |
diff --git a/docs/keycodes_basic.md b/docs/keycodes_basic.md
index 9cc00f032..cba876d34 100644
--- a/docs/keycodes_basic.md
+++ b/docs/keycodes_basic.md
@@ -116,7 +116,7 @@ The basic set of keycodes are based on the [HID Keyboard/Keypad Usage Page (0x07
 |`KC_LGUI`  |`KC_LCMD`, `KC_LWIN`|Left GUI (Windows/Command/Meta key) |
 |`KC_RCTRL` |`KC_RCTL`           |Right Control                       |
 |`KC_RSHIFT`|`KC_RSFT`           |Right Shift                         |
-|`KC_RALT`  |                    |Right Alt                           |
+|`KC_RALT`  |`KC_ALGR`           |Right Alt (AltGr)                   |
 |`KC_RGUI`  |`KC_RCMD`, `KC_RWIN`|Right GUI (Windows/Command/Meta key)|
 
 ## International