[BUG] Extra space in resolved nested language keys

[daniel-jettka]

Describe the problem
Nested language keys are resolved with an extra (superfluous space).

• Instance: https://github.com/Edirom/Edirom-Online/blob/429783adfdd1154afa7839728af4d314be05e418/add/data/locale/edirom-lang-de.xml#L143
• resolution probably here: https://github.com/Edirom/Edirom-Online/blob/429783adfdd1154afa7839728af4d314be05e418/add/data/xslt/edirom_langReplacement.xsl#L54
• also see Ftr/471 enhance update help page Edirom-Online#497 (review)

To Reproduce
Steps to reproduce the behavior, e.g.:

1. Go to a release that contains help pages introduced in #497
2. Open English help, search for "home button"

Expected behavior
Resolve nested key with appropriate amount of spaces

Data
./.

Edirom information

• Release v1.0.0-beta.6

Screenshots