Fix some grammatical issues

app/views/ci/admin/runner_projects/index.html.haml

 %p.lead
-  To register new runner visit #{link_to 'this page ', ci_runners_path}
+  To register a new runner visit #{link_to 'this page ', ci_runners_path}
 .row
   .col-md-8

app/views/ci/admin/runners/index.html.haml

 %p.lead
-  %span To register new runner you should enter the following registration token. With this token the runner will request a unique runner token and use that for future communication.
+  %span To register a new runner you should enter the following registration token. With this token the runner will request a unique runner token and use that for future communication.
   %code #{GitlabCi::REGISTRATION_TOKEN}
 .bs-callout
@@ -21,7 +21,7 @@
         \- run builds from assigned projects
       %li
         %span.label.label-danger paused
-        \- runner will not receive any new build
+        \- runner will not receive any new builds
 .append-bottom-20.clearfix
   .pull-left

app/views/ci/admin/runners/show.html.haml

@@ -13,13 +13,13 @@
 - if @runner.shared?
   .bs-callout.bs-callout-success
-    %h4 This runner will process build from ALL UNASSIGNED projects
+    %h4 This runner will process builds from ALL UNASSIGNED projects
     %p
       If you want runners to build only specific projects, enable them in the table below.
       Keep in mind that this is a one way transition.
 - else
   .bs-callout.bs-callout-info
-    %h4 This runner will process build only from ASSIGNED projects
+    %h4 This runner will process builds only from ASSIGNED projects
     %p You can't make this a shared runner.
 %hr
 = form_for @runner, url: ci_admin_runner_path(@runner), html: { class: 'form-horizontal' } do |f|

app/views/ci/user_sessions/new.html.haml

 .login-block
   %h2 Login using GitLab account
   %p.light
-    Make sure you have account on GitLab server
+    Make sure you have an account on the GitLab server
     = link_to GitlabCi.config.gitlab_server.url, GitlabCi.config.gitlab_server.url, no_turbolink
   %hr
   = link_to "Login with GitLab", auth_ci_user_sessions_path(state: params[:state]), no_turbolink.merge( class: 'btn btn-login btn-success' )
-