Drupal is a great system to run foreign language websites on. The core itself is written in English and modules and themes are expected to follow suit. For developers, very simple wrapper functions are available to mark your translatable strings and let Drupal translate them to whatever language needed. These are the famous t(), the less famous format_plural() and a whole family of other functions. See my cheat sheet (PDF) and the drupal.org documentation for more on this.
Then there is "the other side", whatever does not come from code. Drupal works pretty well and very consistent if you want all of those to be in a foreign language (i.e. not English), but not in multiple languages (any of which can be English at that point). Drupal only has direct multilingual support in nodes (+ fields of entitites) and for path aliases. But life with Drupal means you work with all kinds of other objects like blocks, views, rules, content types, etc which are not "language-aware".
Unfortunately for building multilingual Drupal sites, this is the biggest problem that needs to be worked around. The contributed Internationalization module attempts to fill in the gaps, provide language associations and different workflows for translating these language-unaware objects. This works to some degree, but is really not easy without much help from the modules implementing these objects.
In 2003 I selected Drupal to replace an aging PostNuke system on a Hungarian web developer community site (weblabor.hu) that I helped ignite a few years before. Of course I needed it fully translated to Hungarian. If you were using Drupal back then, you may remember that adding a new language to your site meant running ALTER TABLE queries on your locale tables to add new columns, editing your settings file and handling database dumps of your translations (which was the only way to share them too).
I just got back from Drupalcamp Stockholm 2011, which was an action-packed two days for me to say the least. Due to a busy schedule, I was only able to arrive last minute the night before and leave just right after my sessions on the second day. Once again I decided to do a multilingual session all over again starting from the drawing board. There are lots of new things happening plus I think I'm developing better models to explain the components involved, so I think it was a good idea to build a new presentation. I've also presented on Drupal Security on behalf of the security team, which I hope turned out to be a very informative introduction to some of the most important things to look for when securing sites.
I've first experimented with moving to Drupal 7 on a copy of my blog this January, and that went relatively well. I've had issues with one node module update function and non-unique entries in my files table, but the inconsistent data issues I fixed myself, so the update went smooth. However it did not go live due to hosting and other issues. Of course I don't need to look too far for hosting, Acquia provides fantastic hosting offerings, and just using the cloud hosting product for this migration turned out to be a pleasure. The version control based automated deployment, drag and drop workflows and the availability of command line tool power combined made me able to migrate my blog in a couple hours (with the DNS turnover taking what felt like lots of time after that).
As with all updates, I took a long look at the modules I'm using, and decided to drop some. I've dropped the Feeds module setup for twitter aggregation that I've set up in 2009. I still intend to tie in twitter, but that setup was too much for this simple task. I might end up porting the Aggregator item promotion module that was originally written for the drupal.org redesign but then went unused, to Drupal 7. I've also dropped tagadelic and my flickr feed.
On the other hand, I tried to give more strength to the useful content I have, so decided to create a book module powered compilation of my multilingual Drupal 7 article series for easier navigation. I also believe that this simple configured version of the Bartik theme gives more room to my content and is overall cleaner and more professional compared to what I had before.
Hopefully I'll have some time to tinker with this new setup as time goes and improve it continually. So far I'm definitely satisfied with the results and believe it will be better for my readers as well with the speedier service and slick look.
I'd like to hereby thank my previous provider, hoszting.com for the hosting space they've provided me with over the years.