Admin grammar fixes and improvements (#2056)

options/locale/locale_en-US.ini

@@ -1162,7 +1162,7 @@ first_page = First
 last_page = Last
 total = Total: %d
 
-dashboard.statistic = Statistic
+dashboard.statistic = Statistics
 dashboard.operations = Operations
 dashboard.system_status = System Monitor Status
 dashboard.statistic_info = Gitea database has <b>%d</b> users, <b>%d</b> organizations, <b>%d</b> public keys, <b>%d</b> repositories, <b>%d</b> watches, <b>%d</b> stars, <b>%d</b> actions, <b>%d</b> accesses, <b>%d</b> issues, <b>%d</b> comments, <b>%d</b> social accounts, <b>%d</b> follows, <b>%d</b> mirrors, <b>%d</b> releases, <b>%d</b> login sources, <b>%d</b> webhooks, <b>%d</b> milestones, <b>%d</b> labels, <b>%d</b> hook tasks, <b>%d</b> teams, <b>%d</b> update tasks, <b>%d</b> attachments.
@@ -1179,8 +1179,8 @@ dashboard.delete_missing_repos = Delete all repository records which are missing
 dashboard.delete_missing_repos_success = All repository records which are missing their Git files have been deleted.
 dashboard.git_gc_repos = Execute garbage collection on all repositories
 dashboard.git_gc_repos_success = All repositories have finished executing garbage collection.
-dashboard.resync_all_sshkeys = Rewrite '.ssh/authorized_keys' file (for Gitea SSH keys)
-dashboard.resync_all_sshkeys_success = All public keys have been rewritten.
+dashboard.resync_all_sshkeys = Rewrite '.ssh/authorized_keys' file (for Gitea SSH keys). There is no need to do this if you are using the built-in SSH server.
+dashboard.resync_all_sshkeys_success = All public keys controlled by Gitea have been rewritten.
 dashboard.resync_all_hooks = Resync pre-receive, update and post-receive hooks of all repositories.
 dashboard.resync_all_hooks_success = All repositories' pre-receive, update and post-receive hooks have been resynced.
 dashboard.reinit_missing_repos = Reinitialize all missing Git repositories for which records exist
@@ -1237,17 +1237,17 @@ users.update_profile_success = Account profile has been updated.
 users.edit_account = Edit Account
 users.max_repo_creation = Maximum Repository Creation Limit
 users.max_repo_creation_desc = (Set -1 to use global default limit)
-users.is_activated = This account has completed activation
-users.prohibit_login = This account is blocked from logging in
-users.is_admin = This account has administrator permissions
-users.allow_git_hook = This account has permission to create Git hooks
-users.allow_import_local = This account has permissions to import local repositories
-users.allow_create_organization = This account has permissions to create organizations
+users.is_activated =  Account activated
+users.prohibit_login = Login disabled
+users.is_admin = Administrator permissions
+users.allow_git_hook = Allowed to create git hooks
+users.allow_import_local = Allowed to import local repositories
+users.allow_create_organization = Allowed to create organizations
 users.update_profile = Update Account Profile
-users.delete_account = Delete This Account
-users.still_own_repo = This account still owns one or more repositories, you need to delete or transfer them first.
-users.still_has_org = This account still is a member of one or more organizations, you need to leave or delete the organizations first.
-users.deletion_success = Account has been deleted successfully.
+users.delete_account = Delete Account
+users.still_own_repo = This user still owns one or more repositories. These repositories need to be deleted or transferred first.
+users.still_has_org = This user is still is a member of one or more organizations. This user needs to leave or delete them first.
+users.deletion_success = Account deleted successfully.
 
 orgs.org_manage_panel = Organization Management
 orgs.name = Name
@@ -1279,7 +1279,7 @@ auths.host = Host
 auths.port = Port
 auths.bind_dn = Bind DN
 auths.bind_password = Bind Password
-auths.bind_password_helper = Warning: This password is stored in plain text. Do not use a highly privileged account.
+auths.bind_password_helper = Warning: This password is stored in plain text. It is highly recommended to use read-only account.
 auths.user_base = User Search Base
 auths.user_dn = User DN
 auths.attribute_username = Username attribute
@@ -1314,8 +1314,8 @@ auths.tips.oauth2.general = OAuth2 Authentication
 auths.tips.oauth2.general.tip = When registering a new OAuth2 authentication, the callback/redirect URL should be: <host>/user/oauth2/<Authentication Name>/callback
 auths.tip.oauth2_provider = OAuth2 Provider
 auths.tip.bitbucket = Register a new OAuth consumer on https://bitbucket.org/account/user/<your username>/oauth-consumers/new and add the permission "Account"-"Read"
-auths.tip.dropbox = Create a new App on https://www.dropbox.com/developers/apps
-auths.tip.facebook = Register a new App on https://developers.facebook.com/apps and add the product "Facebook Login"
+auths.tip.dropbox = Create a new application at https://www.dropbox.com/developers/apps
+auths.tip.facebook = Register a new application at https://developers.facebook.com/apps and add the product "Facebook Login"
 auths.tip.github = Register a new OAuth application on https://github.com/settings/applications/new
 auths.tip.gitlab = Register a new application on https://gitlab.com/profile/applications
 auths.tip.google_plus = Obtain OAuth2 client credentials from the Google API console (https://console.developers.google.com/)
@@ -1328,9 +1328,9 @@ auths.update_success = The authentication settings have been updated.
 auths.update = Update Authentication Settings
 auths.delete = Delete This Authentication Source
 auths.delete_auth_title = Delete Authentication Source
-auths.delete_auth_desc = This authentication source will be deleted, are you sure you want to continue?
-auths.still_in_used = This authentication source is still used by some users, please delete or convert these users to another login type first.
-auths.deletion_success = Authentication has been deleted successfully!
+auths.delete_auth_desc = This authentication source is going to be deleted. Are you sure you want to continue?
+auths.still_in_used = This authentication source is still used by one or more users, please delete or convert them to another login source first.
+auths.deletion_success = Authentication has been deleted successfully.
 auths.login_source_exist = Login source '%s' already exists.
 
 config.server_config = Server Configuration