[web] Remove v-html usage

Reinforcing security by remove the usage of v-html.

web-src/src/pages/PageAbout.vue

@@ -140,7 +140,27 @@
                   })
                 "
               />
-              <p class="is-size-7" v-html="$t('page.about.built-with')" />
+              <i18n-t tag="p" class="is-size-7" keypath="page.about.built-with">
+                <template #bulma><a href="https://bulma.io">Bulma</a></template>
+                <template #mdi
+                  ><a href="https://pictogrammers.com/library/mdi/"
+                    >Material Design Icons</a
+                  ></template
+                >
+                <template #vuejs
+                  ><a href="https://vuejs.org/">Vue.js</a></template
+                >
+                <template #axios
+                  ><a href="https://github.com/mzabriskie/axios"
+                    >axios</a
+                  ></template
+                >
+                <template #others
+                  ><a
+                    href="https://github.com/owntone/owntone-server/network/dependencies"
+                    v-text="$t('page.about.more')"
+                /></template>
+              </i18n-t>
             </div>
           </div>
         </div>

web-src/src/pages/PageSearch.vue

@@ -18,9 +18,19 @@
                   />
                   <mdicon class="icon is-left" name="magnify" size="16" />
                 </p>
-                <p class="help has-text-centered">
-                  <span v-html="$t('page.search.help')" />
-                </p>
+                <i18n-t
+                  tag="p"
+                  class="help has-text-centered"
+                  keypath="page.search.help"
+                >
+                  <template #query><code>query:</code></template>
+                  <template #help
+                    ><a
+                      href="https://owntone.github.io/owntone-server/smart-playlists/"
+                      target="_blank"
+                      v-text="$t('page.search.expression')"
+                  /></template>
+                </i18n-t>
               </div>
             </form>
             <div class="tags mt-4">

web-src/src/pages/SettingsPageOnlineServices.vue

@@ -19,7 +19,7 @@
           <div class="mt-5">
             <p
               class="content"
-              v-html="$t('page.settings.services.spotify.grant-access')"
+              v-text="$t('page.settings.services.spotify.grant-access')"
             />
             <p v-if="spotify.webapi_token_valid">
               <span v-text="$t('page.settings.services.spotify.user')" />
@@ -74,7 +74,7 @@
         <div v-if="lastfm.enabled">
           <p
             class="content"
-            v-html="$t('page.settings.services.lastfm.grant-access')"
+            v-text="$t('page.settings.services.lastfm.grant-access')"
           />
           <div v-if="lastfm.scrobbling_enabled">
             <a