refactor: improve tooltips in diagnostics page

The term "seems to" is used too loosely in many of the tooltips, but in
these 2 instances it is wrong wording.
An update is either available or not. If there is no update, one could
argue that "seems to" is valid, since the Internet could be down to
check for a new version. But in this situation the update is availble.
It is impossible that an update seems to be available.

src/static/templates/admin/diagnostics.hbs

@@ -8,7 +8,7 @@
                 <dl class="row">
                     <dt class="col-sm-5">Server Installed
                         <span class="badge bg-success d-none abbr-badge" id="server-success" title="Latest version is installed.">Ok</span>
-                        <span class="badge bg-warning text-dark d-none abbr-badge" id="server-warning" title="There seems to be an update available.">Update</span>
+                        <span class="badge bg-warning text-dark d-none abbr-badge" id="server-warning" title="An update is available.">Update</span>
                         <span class="badge bg-info text-dark d-none abbr-badge" id="server-branch" title="This is a branched version.">Branched</span>
                     </dt>
                     <dd class="col-sm-7">
@@ -23,8 +23,8 @@
                     {{#if page_data.web_vault_enabled}}
                     <dt class="col-sm-5">Web Installed
                         <span class="badge bg-success d-none abbr-badge" id="web-success" title="Latest version is installed.">Ok</span>
-                        <span class="badge bg-warning text-dark d-none abbr-badge" id="web-warning" title="There seems to be an update available.">Update</span>
-                        <span class="badge bg-info text-dark d-none abbr-badge" id="web-prerelease" title="You seem to be using a pre-release version.">Pre-Release</span>
+                        <span class="badge bg-warning text-dark d-none abbr-badge" id="web-warning" title="An update is available.">Update</span>
+                        <span class="badge bg-info text-dark d-none abbr-badge" id="web-prerelease" title="You are using a pre-release version.">Pre-Release</span>
                     </dt>
                     <dd class="col-sm-7">
                         <span id="web-installed">{{page_data.active_web_release}}</span>