Sorting strings elements on UI/BE

[ctapobep]

Short version:

• As much as possible avoid sorting by names and other strings
• If the dataset is small, sort on UI
• If we do need to sort on BE, then we need to set the collation of the column to something like en_US. Before doing this we need to check that "utf8" is going to be prepended by default in PG. We can't hardcode "utf8" in our DB migrations because it's not standardized and could actually be "UTF-8".

At some point we should research ICU support in PG. Though generally we want our clients to use english, in which case there won't be problems with en_US.