added 'greyed out next button in locale' as known issues && added it in installation guide

Author: Byson94

src/content/docs/get-started/installation.md

@@ -85,7 +85,7 @@ The different steps are:
 |------|-----------|
 | Choose your preferred keyboard layout. | ![Select Keyboard](../../../assets/installer/install2-1.png) |
 | Select your timezone | ![Select timezone](../../../assets/installer/install4-1.png) |
-| Set the system locale and date settings | ![Select locale](../../../assets/installer/install5-1.png) |
+| Set the system locale and date settings ([beware of this issue](https://www.axos-project.com/docs/reference/issues/#greyed-out-next-button-in-locale-screen-in-axos-installer)) | ![Select locale](../../../assets/installer/install5-1.png) |
 | Create user account with username, password, and admin rights | ![Create User](../../../assets/installer/users-1.png) |
 | Choose your desktop between Plasma, Calla, or Sleex. See what they are [in the dedicated desktops tab](/docs/reference/desktops/) | ![Select Desktop](../../../assets/installer/install7-1.png) |
 | Choose between Linux or Linux-zen kernel. The Linux kernel aims for stability and the zen focuses on the performances, but is less stable. | ![Select kernel](../../../assets/installer/install8-1.png) |

src/content/docs/reference/issues.md

@@ -15,6 +15,7 @@ description: A list of known issues in AxOS.
 - [Can't boot: /dev/disk/by-label' device did not show up after 30 seconds...](#cant-boot-devdiskby-label-device-did-not-show-up-after-30-seconds)
 - [Blank cheatsheet issue in sleex](#blank-cheatsheet-issue-in-sleex)
 - [Resolution issue in sleex](#resolution-issue-in-sleex)
+- [Greyed out next button in locale screen in AxOS installer](#greyed-out-next-button-in-locale-screen-in-axos-installer)
 
 ### Invalid or corrupted packages
 
@@ -78,6 +79,14 @@ Is your sleex widgets overflowing? It's a known issue in sleex.
 
 Currently there is no fix for this but the maintainers of sleex are working on fixing this issue.
 
+### Greyed out next button in locale screen in AxOS installer
+
+This happens because the locale that you selected is not installed in the system.
+
+To fix this, edit `/etc/locale.gen` and uncomment the locale that you want. Then, run `locale-gen` in a terminal to install locale that you want.
+
+If you don't want this method, then you can select another locale that is installed on the system.
+
 ### Report an issue
 
 If your issue is not listed here, please open an issue on the [GitHub repository](https://github.com/AxOS-project/axos), or contact us on [Discord](https://discord.gg/sG3NBMYg77) or via email at [[email protected]](mailto:[email protected]).