Localization

[hpk42]

iOS needs to support localization -- a bit unclear how soon as it's probably more interesting to get some basic features first (as of May 2019).

next paragraph is from @r10s, sorry, @hpk42 for writing in your issue. but such feature lists are rather useful ;)

• target the issue of strings used as IDs as written down below
• check which format is used by ios
• write a shell or python script that pulls strings.xml translations in all languages from transifex and converts them to the format used by ios
• replace hard-coded strings by replaceable strings in the way this is done typically by ios
• make sure, delta chat is shown in the system language

[r10s]

before localization can be done, things as https://github.com/deltachat/deltachat-ios/blob/master/deltachat-ios/Controller/SettingsController.swift where titles are used as ids MUST be refactored.