Jonas Jenwald fe3f074f6d Collect the l10n error/warning message lookup, in web/app.js, in a new helper method
Some of the localization strings (e.g. "loading_error") are repeated multiple times throughout the `web/app.js` file, which means that we need to duplicate the fallback strings as well. Furthermore, the signature of the `IL10n.get` method makes the call-sites quite verbose.

By adding a new helper method, in `PDFViewerApplication`, we're able to gather the localization fallback strings in one central spot in `web/app.js` and also make the lookup of the error/warning messages more compact.
2021-02-11 12:30:53 +01:00
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