Use neutral language in comments and docs (#20135)

- Replace `his/her` to `their`, as it's more neutral language.

docs/content/doc/developers/oauth2-provider.md

@@ -41,13 +41,13 @@ To use the Authorization Code Grant as a third party application it is required
 
 ## Scopes
 
-Currently Gitea does not support scopes (see [#4300](https://github.com/go-gitea/gitea/issues/4300)) and all third party applications will be granted access to all resources of the user and his/her organizations.
+Currently Gitea does not support scopes (see [#4300](https://github.com/go-gitea/gitea/issues/4300)) and all third party applications will be granted access to all resources of the user and their organizations.
 
 ## Example
 
 **Note:** This example does not use PKCE.
 
-1. Redirect to user to the authorization endpoint in order to get his/her consent for accessing the resources:
+1. Redirect to user to the authorization endpoint in order to get their consent for accessing the resources:
 
    ```curl
    https://[YOUR-GITEA-URL]/login/oauth/authorize?client_id=CLIENT_ID&redirect_uri=REDIRECT_URI& response_type=code&state=STATE

docs/content/doc/developers/oauth2-provider.zh-tw.md

@@ -46,7 +46,7 @@ Gitea 支援作為 OAuth2 提供者，能讓第三方程式能在使用者同意
 **備註：** 此範例未使用 PKCE。
 
 1. 重新導向使用者到 authorization endpoint 以獲得他同意授權存取資源：
-    <!-- 1. Redirect to user to the authorization endpoint in order to get his/her consent for accessing the resources: -->
+    <!-- 1. Redirect to user to the authorization endpoint in order to get their consent for accessing the resources: -->
 
    ```curl
    https://[YOUR-GITEA-URL]/login/oauth/authorize?client_id=CLIENT_ID&redirect_uri=REDIRECT_URI& response_type=code&state=STATE

models/migrations/v154.go

@@ -30,7 +30,7 @@ func addTimeStamps(x *xorm.Engine) error {
 		return err
 	}
 
-	// Follow represents relations of user and his/her followers.
+	// Follow represents relations of user and their followers.
 	type Follow struct {
 		CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
 	}

models/org.go

@@ -149,7 +149,7 @@ func removeOrgUser(ctx context.Context, orgID, userID int64) error {
 		}
 	}
 
-	// Delete member in his/her teams.
+	// Delete member in their teams.
 	teams, err := organization.GetUserOrgTeams(ctx, org.ID, userID)
 	if err != nil {
 		return err

models/user/follow.go

@@ -9,7 +9,7 @@ import (
 	"code.gitea.io/gitea/modules/timeutil"
 )
 
-// Follow represents relations of user and his/her followers.
+// Follow represents relations of user and their followers.
 type Follow struct {
 	ID          int64              `xorm:"pk autoincr"`
 	UserID      int64              `xorm:"UNIQUE(follow)"`

models/user/user.go

@@ -86,7 +86,7 @@ type User struct {
 	PasswdHashAlgo               string `xorm:"NOT NULL DEFAULT 'argon2'"`
 
 	// MustChangePassword is an attribute that determines if a user
-	// is to change his/her password after registration.
+	// is to change their password after registration.
 	MustChangePassword bool `xorm:"NOT NULL DEFAULT false"`
 
 	LoginType   auth.Type
@@ -537,7 +537,7 @@ func GetUserSalt() (string, error) {
 	return hex.EncodeToString(rBytes), nil
 }
 
-// NewGhostUser creates and returns a fake user for someone has deleted his/her account.
+// NewGhostUser creates and returns a fake user for someone has deleted their account.
 func NewGhostUser() *User {
 	return &User{
 		ID:        -1,

routers/web/auth/password.go

@@ -274,7 +274,7 @@ func MustChangePassword(ctx *context.Context) {
 	ctx.HTML(http.StatusOK, tplMustChangePassword)
 }
 
-// MustChangePasswordPost response for updating a user's password after his/her
+// MustChangePasswordPost response for updating a user's password after their
 // account was created by an admin
 func MustChangePasswordPost(ctx *context.Context) {
 	form := web.GetForm(ctx).(*forms.MustChangePasswordForm)