i18n: fix non-matching 1st line indentations When generating documentation, indentation must match for getting the same view for translated messages. Often an output is generated anyway, but it can look different. When a syntactically wrong indentation change is done, runrst will fail (this is detected by test-gendoc.t). Fix the simple places. When translation knowledge is necessary, the entry is marked as fuzzy (and therefore skipped when generating translations). A translator can fix it later.