Minor English language file tweaks (#852)

* Minor language file tweaks (largely fixing awkward grammar).

Signed-off-by: Tux <write@imaginarycode.com>

* Modify federated_avatar_lookup_popup message

options/locale/locale_en-US.ini

@@ -102,23 +102,23 @@ server_service_title = Server and Other Services Settings
 offline_mode = Enable Offline Mode
 offline_mode_popup = Disable CDN even in production mode, all resource files will be served locally.
 disable_gravatar = Disable Gravatar Service
-disable_gravatar_popup = Disable Gravatar and custom sources, all avatars are uploaded by users or default.
+disable_gravatar_popup = Disable Gravatar and custom sources. All avatars must be uploaded by users or the default avatar will be used.
 federated_avatar_lookup = Enable Federated Avatars Lookup
-federated_avatar_lookup_popup = Enable federated avatars lookup to use federated open source service based on libravatar.
+federated_avatar_lookup_popup = Enable federated avatar lookup using Libravatar.
 disable_registration = Disable Self-registration
 disable_registration_popup = Disable user self-registration, only admin can create accounts.
 enable_captcha = Enable Captcha
-enable_captcha_popup = Require validate captcha for user self-registration.
+enable_captcha_popup = Require a CAPTCHA for user self-registration.
 require_sign_in_view = Enable Require Sign In to View Pages
 require_sign_in_view_popup = Only signed in users can view pages, visitors will only be able to see sign in/up pages.
-admin_setting_desc = You do not have to create an admin account right now, user whoever ID=1 will gain admin access automatically.
+admin_setting_desc = You do not have to create an admin account right now. The first user who registers on the site will gain admin access automatically.
 admin_title = Admin Account Settings
 admin_name = Username
 admin_password = Password
 confirm_password = Confirm Password
 admin_email = Admin Email
 install_btn_confirm = Install Gitea
-test_git_failed = Fail to test 'git' command: %v
+test_git_failed = Could not test 'git' command: %v
 sqlite3_not_available = Your release version does not support SQLite3, please download the official binary version from %s, NOT the gobuild version.
 invalid_db_setting = Database setting is not correct: %v
 invalid_repo_path = Repository root path is invalid: %v
@@ -228,7 +228,7 @@ email_error = ` is not a valid email address.`
 url_error = ` is not a valid URL.`
 include_error = ` must contain substring '%s'.`
 unknown_error = Unknown error:
-captcha_incorrect = Captcha didn't match.
+captcha_incorrect = CAPTCHA is incorrect.
 password_not_match = Password and confirm password are not same.
 
 username_been_taken = Username has already been taken.
@@ -669,8 +669,8 @@ milestones.filter_sort.most_issues = Most issues
 milestones.filter_sort.least_issues = Least issues
 
 wiki = Wiki
-wiki.welcome = Welcome to Wiki!
-wiki.welcome_desc = Wiki is the place where you would like to document your project together and make it better.
+wiki.welcome = Welcome to the project wiki!
+wiki.welcome_desc = A wiki allows you or your users to easily document your project.
 wiki.create_first_page = Create the first page
 wiki.page = Page
 wiki.filter_page = Filter page
@@ -682,7 +682,7 @@ wiki.edit_page_button = Edit
 wiki.new_page_button = New Page
 wiki.delete_page_button = Delete Page
 wiki.delete_page_notice_1 = This will delete the page <code>"%s"</code>. Please be certain.
-wiki.page_already_exists = Wiki page with same name already exists.
+wiki.page_already_exists = A wiki page with the same name already exists.
 wiki.pages = Pages
 wiki.last_updated = Last updated %s
 
@@ -706,12 +706,12 @@ settings.wiki_desc = Enable wiki system
 settings.use_internal_wiki = Use builtin wiki
 settings.use_external_wiki = Use external wiki
 settings.external_wiki_url = External Wiki URL
-settings.external_wiki_url_desc = Visitors will be redirected to URL when they click on the tab.
+settings.external_wiki_url_desc = Visitors will be redirected to the specified URL when they click on the tab.
 settings.issues_desc = Enable issue tracker
-settings.use_internal_issue_tracker = Use builtin lightweight issue tracker
+settings.use_internal_issue_tracker = Use builtin issue tracker
 settings.use_external_issue_tracker = Use external issue tracker
 settings.external_tracker_url = External Issue Tracker URL
-settings.external_tracker_url_desc = Visitors will be redirected to URL when they click on the tab.
+settings.external_tracker_url_desc = Visitors will be redirected to the specified URL when they click on the tab.
 settings.tracker_url_format = External Issue Tracker URL Format
 settings.tracker_issue_style = External Issue Tracker Naming Style:
 settings.tracker_issue_style.numeric = Numeric