Change all 'Has more' with loading animation

packages/rocketchat-i18n/i18n/en.i18n.json

...etchat-mentions-flextab/client/views/mentionsFlexTab.html

...s/rocketchat-message-pin/client/views/pinnedMessages.html

...essage-snippet/client/tabBar/views/snippetedMessages.html

...rocketchat-message-star/client/views/starredMessages.html

packages/rocketchat-theme/assets/stylesheets/base.less

...etchat-theme/assets/stylesheets/utils/_colors.import.less

...es/rocketchat-ui-flextab/flex-tab/tabs/messageSearch.html

...ocketchat-ui-flextab/flex-tab/tabs/uploadedFilesList.html

packages/rocketchat-ui-master/master/loading.html

packages/rocketchat-ui-master/server/inject.js

...ages/rocketchat-ui-sidenav/side-nav/listChannelsFlex.html

...ages/rocketchat-ui-sidenav/side-nav/listCombinedFlex.html

...ocketchat-ui-sidenav/side-nav/listDirectMessagesFlex.html

...rocketchat-ui-sidenav/side-nav/listPrivateGroupsFlex.html

packages/rocketchat-ui/views/app/room.html